Revert of [GCM] Start GCMChannelStatusSyncer when GCM is disabled (patchset #2 id:20001 of https://codereview.chromium.org/653843003/)

Reason for revert:
Reverted due to that the fix is not complete. Will fix one more issue we find and reland the patch.

Original issue's description:
> [GCM] Start GCMChannelStatusSyncer when GCM is disabled
>
> We need to start GCMChannelStatusSyncer when GCM is disabled in order
> to poll the server to find out when it is reenabled.
>
> Also if server returns empty response, we should not treat it as error
> and trigger the backoff logic.
>
> BUG=423415
> TEST=new tests added
>
> Committed: https://crrev.com/9e9dd3b7798b3500d70941af04b1325ef9a0b544
> Cr-Commit-Position: refs/heads/master@{#299518}

[email protected]
NOTREECHECKS=true
NOTRY=true
BUG=423415

Review URL: https://codereview.chromium.org/657703002

Cr-Commit-Position: refs/heads/master@{#299579}
diff --git a/components/gcm_driver/gcm_channel_status_syncer.cc b/components/gcm_driver/gcm_channel_status_syncer.cc
index 4be2eae..443c90d5 100644
--- a/components/gcm_driver/gcm_channel_status_syncer.cc
+++ b/components/gcm_driver/gcm_channel_status_syncer.cc
@@ -111,8 +111,7 @@
   weak_ptr_factory_.InvalidateWeakPtrs();
 }
 
-void GCMChannelStatusSyncer::OnRequestCompleted(bool update_received,
-                                                bool enabled,
+void GCMChannelStatusSyncer::OnRequestCompleted(bool enabled,
                                                 int poll_interval_seconds) {
   DCHECK(request_);
   request_.reset();
@@ -122,23 +121,20 @@
   prefs_->SetInt64(kGCMChannelLastCheckTime,
                    last_check_time_.ToInternalValue());
 
-  if (update_received) {
-    if (gcm_enabled_ != enabled) {
-      gcm_enabled_ = enabled;
-      prefs_->SetBoolean(kGCMChannelStatus, enabled);
-      if (gcm_enabled_)
-        driver_->Enable();
-      else
-        driver_->Disable();
-    }
+  if (gcm_enabled_ != enabled) {
+    gcm_enabled_ = enabled;
+    prefs_->SetBoolean(kGCMChannelStatus, enabled);
+    if (gcm_enabled_)
+      driver_->Enable();
+    else
+      driver_->Disable();
+  }
 
-    DCHECK_GE(poll_interval_seconds,
-              GCMChannelStatusRequest::min_poll_interval_seconds());
-    if (poll_interval_seconds_ != poll_interval_seconds) {
-      poll_interval_seconds_ = poll_interval_seconds;
-      prefs_->SetInteger(kGCMChannelPollIntervalSeconds,
-                         poll_interval_seconds_);
-    }
+  DCHECK_GE(poll_interval_seconds,
+            GCMChannelStatusRequest::min_poll_interval_seconds());
+  if (poll_interval_seconds_ != poll_interval_seconds) {
+    poll_interval_seconds_ = poll_interval_seconds;
+    prefs_->SetInteger(kGCMChannelPollIntervalSeconds, poll_interval_seconds_);
   }
 
   ScheduleRequest();