Move IdentityProvider usage from GCMDriverDesktop to GCMProfileService

components/gcm_driver/gcm_driver.h

Index: components/gcm_driver/gcm_driver.h
diff --git a/components/gcm_driver/gcm_driver.h b/components/gcm_driver/gcm_driver.h
index e2fe882532c28d68fd2494c96387cebb949af421..67cb4a80d4de7415a7f146554483858c96106cc9 100644
--- a/components/gcm_driver/gcm_driver.h
+++ b/components/gcm_driver/gcm_driver.h
@@ -67,6 +67,14 @@ class GCMDriver {
   // been called, no other GCMDriver methods may be used.
   virtual void Shutdown();
 
+  // Call when the sign-in occurs.

[bartfab (slow), 2014/06/13 11:27:21]

Nit: Could you reword this to make it more explicit that this needs to be called
from the outside? The sentence is correct as-is but I have seen many places
where people confused "call" and "called" in comments. Making it more explicit
will ensure that the sentence is not misunderstood by anyone. How about
something like:

// Call this method when the user signs in to a GAIA account.

[jianli, 2014/06/13 18:04:49]

Done.

+  // TODO(jianli): to be removed when sign-in enforcement is dropped.
+  virtual void SignIn() = 0;
+
+  // Removes all the cached and persisted GCM data. If the GCM service is
+  // restarted after the purge, a new Android ID will be obtained.
+  virtual void Purge() = 0;
+
   // Adds a handler for a given app.
   virtual void AddAppHandler(const std::string& app_id, GCMAppHandler* handler);
 
@@ -96,9 +104,6 @@ class GCMDriver {
   virtual void SetGCMRecording(const GetGCMStatisticsCallback& callback,
                                bool recording) = 0;
 
-  // Returns the user name if the profile is signed in. Empty string otherwise.
-  virtual std::string SignedInUserName() const = 0;
-
  protected:
   // Ensures that the GCM service starts (if necessary conditions are met).
   virtual GCMClient::Result EnsureStarted() = 0;