[ios] ARCMigrate ios/chrome/browser/tabs/tab_model.mm to ARC.

ios/chrome/browser/tabs/BUILD.gn

Index: ios/chrome/browser/tabs/BUILD.gn
diff --git a/ios/chrome/browser/tabs/BUILD.gn b/ios/chrome/browser/tabs/BUILD.gn
index c7d2f3454fd11e49ed63d0890b3c5af42f83ac62..4087b343ef67359fd6a641db2c493a226e546343 100644
--- a/ios/chrome/browser/tabs/BUILD.gn
+++ b/ios/chrome/browser/tabs/BUILD.gn
@@ -33,96 +33,11 @@ source_set("tabs") {
 
 source_set("tabs_internal") {
   sources = [
-    "tab_model.mm",
-  ]
-  deps = [
-    ":tabs",
-    ":tabs_internal_arc",
-    "//base",
-    "//components/content_settings/core/browser",
-    "//components/favicon/core",
-    "//components/favicon/ios",
-    "//components/google/core/browser",
-    "//components/history/core/browser",
-    "//components/history/ios/browser",
-    "//components/infobars/core",
-    "//components/keyed_service/core",
-    "//components/metrics_services_manager",
-    "//components/navigation_metrics",
-    "//components/prefs",
-    "//components/reading_list/core",
-    "//components/search_engines",
-    "//components/sessions",
-    "//components/signin/core/browser",
-    "//components/signin/ios/browser",
-    "//components/strings",
-    "//components/url_formatter",
-    "//ios/chrome/app/strings",
-    "//ios/chrome/browser",
-    "//ios/chrome/browser/autofill",
-    "//ios/chrome/browser/autofill:autofill_internal",
-    "//ios/chrome/browser/bookmarks",
-    "//ios/chrome/browser/browser_state",
-    "//ios/chrome/browser/content_settings",
-    "//ios/chrome/browser/favicon",
-    "//ios/chrome/browser/find_in_page",
-    "//ios/chrome/browser/geolocation:geolocation_internal",
-    "//ios/chrome/browser/history",
-    "//ios/chrome/browser/infobars",
-    "//ios/chrome/browser/metrics",
-    "//ios/chrome/browser/metrics:metrics_internal",
-    "//ios/chrome/browser/native_app_launcher:native_app_launcher_internal",
-    "//ios/chrome/browser/passwords",
-    "//ios/chrome/browser/passwords:passwords_internal",
-    "//ios/chrome/browser/reading_list",
-    "//ios/chrome/browser/search_engines",
-    "//ios/chrome/browser/sessions",
-    "//ios/chrome/browser/sessions:serialisation",
-    "//ios/chrome/browser/signin",
-    "//ios/chrome/browser/signin:signin_internal",
-    "//ios/chrome/browser/snapshots",
-    "//ios/chrome/browser/snapshots:snapshots_internal",
-    "//ios/chrome/browser/ssl",
-    "//ios/chrome/browser/store_kit",
-    "//ios/chrome/browser/sync",
-    "//ios/chrome/browser/translate",
-    "//ios/chrome/browser/u2f",
-    "//ios/chrome/browser/ui",
-    "//ios/chrome/browser/ui:ui_internal",
-    "//ios/chrome/browser/ui/alert_coordinator",
-    "//ios/chrome/browser/ui/commands",
-    "//ios/chrome/browser/ui/downloads",
-    "//ios/chrome/browser/ui/overscroll_actions",
-    "//ios/chrome/browser/ui/reader_mode",
-    "//ios/chrome/browser/ui/sad_tab",
-    "//ios/chrome/browser/ui/toolbar",
-    "//ios/chrome/browser/ui/util",
-    "//ios/chrome/browser/web",
-    "//ios/chrome/browser/web:sad_tab_tab_helper_delegate",
-    "//ios/chrome/browser/web:web_internal",
-    "//ios/chrome/browser/web_state_list",
-    "//ios/net",
-    "//ios/public/provider/chrome/browser",
-    "//ios/public/provider/chrome/browser/native_app_launcher",
-    "//ios/web",
-    "//ios/web:user_agent",
-    "//net",
-    "//ui/base",
-    "//url",
-  ]
-  allow_circular_includes_from = [ ":tabs_internal_arc" ]
-  libs = [
-    "CoreLocation.framework",
-    "UIKit.framework",
-  ]
-}
-
-source_set("tabs_internal_arc") {
-  sources = [
     "legacy_tab_helper.mm",
     "tab.h",
     "tab.mm",
     "tab_helper_util.mm",
+    "tab_model.mm",
     "tab_model_closing_web_state_observer.h",
     "tab_model_closing_web_state_observer.mm",
     "tab_model_list.mm",