Refactor AO2TS to make it easier to componentize.

components/signin/ios/browser/profile_oauth2_token_service_ios.mm

Index: components/signin/ios/browser/profile_oauth2_token_service_ios.mm
diff --git a/components/signin/ios/browser/profile_oauth2_token_service_ios.mm b/components/signin/ios/browser/profile_oauth2_token_service_ios.mm
index 2eb3cff42429ff2564df047782c82c5e57351f19..8931fae477a6573dfcfb40a095cbca08f530069e 100644
--- a/components/signin/ios/browser/profile_oauth2_token_service_ios.mm
+++ b/components/signin/ios/browser/profile_oauth2_token_service_ios.mm
@@ -309,19 +309,17 @@ ProfileOAuth2TokenServiceIOS::CreateAccessTokenFetcher(
   return new SSOAccessTokenFetcher(consumer, GetProvider(), account_id);
 }
 
-void ProfileOAuth2TokenServiceIOS::InvalidateOAuth2Token(
+void ProfileOAuth2TokenServiceIOS::InvalidateAccessToken(
     const std::string& account_id,
     const std::string& client_id,
     const ScopeSet& scopes,
     const std::string& access_token) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  // Call |ProfileOAuth2TokenService::InvalidateOAuth2Token| to clear the
+  // Call |ProfileOAuth2TokenService::InvalidateAccessToken| to clear the
   // cached access token.
-  ProfileOAuth2TokenService::InvalidateOAuth2Token(account_id,
-                                                   client_id,
-                                                   scopes,
-                                                   access_token);
+  ProfileOAuth2TokenService::InvalidateAccessToken(account_id, client_id,
+                                                   scopes, access_token);
 
   // There is no need to inform the authentication library that the access
   // token is invalid as it never caches the token.