Undoing revert, cl is not the cause of gcm crash on canary.

chrome/browser/extensions/api/copresence/copresence_api.cc

Index: chrome/browser/extensions/api/copresence/copresence_api.cc
diff --git a/chrome/browser/extensions/api/copresence/copresence_api.cc b/chrome/browser/extensions/api/copresence/copresence_api.cc
index 7e9167474fe7f4e46d8874637f3c839a561301ac..f4ae23e05bf93849a46454c645903560a43736f2 100644
--- a/chrome/browser/extensions/api/copresence/copresence_api.cc
+++ b/chrome/browser/extensions/api/copresence/copresence_api.cc
@@ -7,6 +7,8 @@
 #include "base/lazy_instance.h"
 #include "base/memory/linked_ptr.h"
 #include "chrome/browser/copresence/chrome_whispernet_client.h"
+#include "chrome/browser/services/gcm/gcm_profile_service.h"
+#include "chrome/browser/services/gcm/gcm_profile_service_factory.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/extensions/api/copresence.h"
 #include "components/copresence/copresence_manager_impl.h"
@@ -145,6 +147,11 @@ copresence::WhispernetClient* CopresenceService::GetWhispernetClient() {
   return whispernet_client();
 }
 
+gcm::GCMDriver* CopresenceService::GetGCMDriver() {
+  return gcm::GCMProfileServiceFactory::GetForProfile(browser_context_)
+      ->driver();
+}
+
 template <>
 void
 BrowserContextKeyedAPIFactory<CopresenceService>::DeclareFactoryDependencies() {