diff --git a/build/commands/lib/gnCheck.js b/build/commands/lib/gnCheck.js
index b633cf9fe3d2..05808142b215 100644
--- a/build/commands/lib/gnCheck.js
+++ b/build/commands/lib/gnCheck.js
@@ -10,6 +10,16 @@ const gnCheck = (buildConfig = config.defaultBuildConfig, options = {}) => {
   config.buildConfig = buildConfig
   config.update(options)
   util.run('gn', ['check', config.outputDir], config.defaultOptions)
+  util.run(
+    'python3',
+    [
+      'buildtools/checkdeps/checkdeps.py',
+      'brave',
+      '--extra-repos=brave',
+      '--no-resolve-dotdot'
+    ],
+    config.defaultOptions
+  )
 }
 
 module.exports = gnCheck
diff --git a/chromium_src/chrome/renderer/DEPS b/chromium_src/chrome/renderer/DEPS
index 8115829ae7da..3bf0f3cd4eeb 100644
--- a/chromium_src/chrome/renderer/DEPS
+++ b/chromium_src/chrome/renderer/DEPS
@@ -1,4 +1,6 @@
 include_rules = [
+  "+brave/components/ai_chat/core/common",
+  "+brave/components/ai_chat/renderer",
   "+brave/components/body_sniffer",
   "+brave/components/brave_shields/core/common",
   "+brave/components/content_settings/renderer",
diff --git a/chromium_src/components/content_settings/core/common/cookie_settings_base.cc b/chromium_src/components/content_settings/core/common/cookie_settings_base.cc
index 2a6915bd949d..7e4c1993dceb 100644
--- a/chromium_src/components/content_settings/core/common/cookie_settings_base.cc
+++ b/chromium_src/components/content_settings/core/common/cookie_settings_base.cc
@@ -18,7 +18,6 @@
 #include "net/base/features.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/cookies/site_for_cookies.h"
-#include "third_party/abseil-cpp/absl/base/attributes.h"
 #include "url/gurl.h"
 #include "url/origin.h"
 
diff --git a/components/DEPS b/components/DEPS
index 7566537e6ce8..45b0d513f4bf 100644
--- a/components/DEPS
+++ b/components/DEPS
@@ -10,3 +10,82 @@ include_rules = [
   # these dependencies; see /components/README.
   "-ipc",
 ]
+
+specific_include_rules = {
+  # IMPORTANT: Do not add new browser tests that depend on //chrome or
+  # //brave/browser/ to //brave/components.
+  #
+  # This is an exclusion list for browser tests written before proper dependency
+  # checking was implemented. These tests should be migrated out of
+  # //brave/components into //brave/browser eventually.
+  "android_page_appearing_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "brave_content_settings_agent_impl_browsertest\.cc": [
+    "+chrome",
+    "+content",
+  ],
+  "brave_wayback_machine_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "de_amp_browsertest\.cc": [
+    "+chrome",
+    "+content",
+  ],
+  "perf_predictor_tab_helper_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_browsertest_context_helper\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_browsertest_context_helper\.h": [
+    "+chrome",
+  ],
+  "rewards_browsertest_contribution\.cc": [
+    "+chrome",
+  ],
+  "rewards_browsertest_response\.cc": [
+    "+chrome",
+  ],
+  "rewards_browsertest_util\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_contribution_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_flag_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_notification_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_p3a_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_publisher_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "rewards_state_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+  ],
+  "webcompat_exceptions_browsertest\.cc": [
+    "+brave/browser",
+    "+chrome",
+    "+content",
+  ],
+}
diff --git a/components/brave_search/renderer/brave_search_service_worker_holder.cc b/components/brave_search/renderer/brave_search_service_worker_holder.cc
index 427b63b14a33..c13075b4dd32 100644
--- a/components/brave_search/renderer/brave_search_service_worker_holder.cc
+++ b/components/brave_search/renderer/brave_search_service_worker_holder.cc
@@ -15,7 +15,6 @@
 #include "brave/components/brave_search/common/brave_search_utils.h"
 #include "brave/components/brave_search/renderer/brave_search_fallback_js_handler.h"
 #include "content/public/renderer/worker_thread.h"
-#include "third_party/abseil-cpp/absl/base/attributes.h"
 #include "url/gurl.h"
 
 namespace brave_search {
@@ -25,7 +24,7 @@ namespace {
 class JsHandlersForCurrentThread;
 
 // A thread local pointer for the js handlers available.
-ABSL_CONST_INIT thread_local JsHandlersForCurrentThread* current_js_handlers =
+constinit thread_local JsHandlersForCurrentThread* current_js_handlers =
     nullptr;
 
 // A scoping class to create a local thread storage for the JS handlers, storing