Change signin classes to objc files.

This allows more flexibility when including header files that contain
objc references.

Bug: 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I3bf28ef2c367348906fe7be8481aa348480720a0
Reviewed-on: https://chromium-review.googlesource.com/747093
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513212}

ios/web_view/BUILD.gn

@@ -87,22 +87,22 @@ ios_web_view_sources = [
   "internal/pref_names.h",
   "internal/signin/ios_web_view_signin_client.h",
   "internal/signin/ios_web_view_signin_client.mm",
-  "internal/signin/web_view_account_fetcher_service_factory.cc",
   "internal/signin/web_view_account_fetcher_service_factory.h",
-  "internal/signin/web_view_account_tracker_service_factory.cc",
+  "internal/signin/web_view_account_fetcher_service_factory.mm",
   "internal/signin/web_view_account_tracker_service_factory.h",
-  "internal/signin/web_view_gaia_cookie_manager_service_factory.cc",
+  "internal/signin/web_view_account_tracker_service_factory.mm",
   "internal/signin/web_view_gaia_cookie_manager_service_factory.h",
+  "internal/signin/web_view_gaia_cookie_manager_service_factory.mm",
   "internal/signin/web_view_oauth2_token_service_factory.h",
   "internal/signin/web_view_oauth2_token_service_factory.mm",
   "internal/signin/web_view_profile_oauth2_token_service_ios_provider_impl.h",
   "internal/signin/web_view_profile_oauth2_token_service_ios_provider_impl.mm",
-  "internal/signin/web_view_signin_client_factory.cc",
   "internal/signin/web_view_signin_client_factory.h",
-  "internal/signin/web_view_signin_error_controller_factory.cc",
+  "internal/signin/web_view_signin_client_factory.mm",
   "internal/signin/web_view_signin_error_controller_factory.h",
-  "internal/signin/web_view_signin_manager_factory.cc",
+  "internal/signin/web_view_signin_error_controller_factory.mm",
   "internal/signin/web_view_signin_manager_factory.h",
+  "internal/signin/web_view_signin_manager_factory.mm",
   "internal/translate/cwv_translation_controller.mm",
   "internal/translate/cwv_translation_controller_internal.h",
   "internal/translate/cwv_translation_language_internal.h",

ios/web_view/internal/signin/web_view_account_fetcher_service_factory.cc → ios/web_view/internal/signin/web_view_account_fetcher_service_factory.mm

@@ -17,6 +17,10 @@
 #include "ios/web_view/internal/signin/web_view_signin_client_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 WebViewAccountFetcherServiceFactory::WebViewAccountFetcherServiceFactory()

ios/web_view/internal/signin/web_view_account_tracker_service_factory.cc → ios/web_view/internal/signin/web_view_account_tracker_service_factory.mm

@@ -14,6 +14,10 @@
 #include "ios/web_view/internal/signin/web_view_signin_client_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 WebViewAccountTrackerServiceFactory::WebViewAccountTrackerServiceFactory()

ios/web_view/internal/signin/web_view_gaia_cookie_manager_service_factory.cc → ios/web_view/internal/signin/web_view_gaia_cookie_manager_service_factory.mm

@@ -16,6 +16,10 @@
 #include "ios/web_view/internal/signin/web_view_signin_client_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 WebViewGaiaCookieManagerServiceFactory::WebViewGaiaCookieManagerServiceFactory()

ios/web_view/internal/signin/web_view_signin_client_factory.cc → ios/web_view/internal/signin/web_view_signin_client_factory.mm

@@ -15,6 +15,10 @@
 #include "ios/web_view/internal/signin/web_view_signin_error_controller_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 // static

ios/web_view/internal/signin/web_view_signin_error_controller_factory.cc → ios/web_view/internal/signin/web_view_signin_error_controller_factory.mm

@@ -11,6 +11,10 @@
 #include "components/signin/core/browser/signin_error_controller.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 // static

ios/web_view/internal/signin/web_view_signin_manager_factory.cc → ios/web_view/internal/signin/web_view_signin_manager_factory.mm

@@ -21,6 +21,10 @@
 #include "ios/web_view/internal/signin/web_view_signin_client_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace ios_web_view {
 
 WebViewSigninManagerFactory::WebViewSigninManagerFactory()