Refactor AO2TS to make it easier to componentize.

ios/public/provider/chrome/browser/keyed_service_provider.h

Index: ios/public/provider/chrome/browser/keyed_service_provider.h
diff --git a/ios/public/provider/chrome/browser/keyed_service_provider.h b/ios/public/provider/chrome/browser/keyed_service_provider.h
index 52547daf9fbf7ed31c3f699f0fcfbff1c22928d2..045cde03fe1d4d865530587044c71684e34e81d0 100644
--- a/ios/public/provider/chrome/browser/keyed_service_provider.h
+++ b/ios/public/provider/chrome/browser/keyed_service_provider.h
@@ -11,7 +11,7 @@
 enum class ServiceAccessType;
 
 class KeyedServiceBaseFactory;
-class ProfileOAuth2TokenServiceIOS;
+class ProfileOAuth2TokenService;
 class SigninManager;
 
 namespace autofill {
@@ -55,13 +55,13 @@ class KeyedServiceProvider {
   virtual bookmarks::BookmarkModel* GetBookmarkModelForBrowserState(
       ChromeBrowserState* browser_state) = 0;
 
-  // Returns the ProfileOAuth2TokenServiceIOS factory for dependencies.
-  virtual KeyedServiceBaseFactory* GetProfileOAuth2TokenServiceIOSFactory() = 0;
+  // Returns the ProfileOAuth2TokenService factory for dependencies.
+  virtual KeyedServiceBaseFactory* GetProfileOAuth2TokenServiceFactory() = 0;
 
-  // Returns an instance of ProfileOAuth2TokenServiceIOS tied to
+  // Returns an instance of ProfileOAuth2TokenService tied to
   // |browser_state|.
-  virtual ProfileOAuth2TokenServiceIOS*
-  GetProfileOAuth2TokenServiceIOSForBrowserState(
+  virtual ProfileOAuth2TokenService*
+  GetProfileOAuth2TokenServiceForBrowserState(
       ChromeBrowserState* browser_state) = 0;
 
   // Returns the SigninManager factory for dependencies.