Remove weak_ptr from CopresenceManager.

components/copresence/copresence_manager_impl.h

Index: components/copresence/copresence_manager_impl.h
diff --git a/components/copresence/copresence_manager_impl.h b/components/copresence/copresence_manager_impl.h
index 5134401391d6f4577d8dbdc2c1680c28c17a905c..24169a0cd482dfe6bfc0bcf853c85e0acb69f3a8 100644
--- a/components/copresence/copresence_manager_impl.h
+++ b/components/copresence/copresence_manager_impl.h
@@ -11,7 +11,6 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
 #include "components/copresence/proto/rpcs.pb.h"
 #include "components/copresence/public/copresence_manager.h"
 
@@ -35,8 +34,7 @@ struct PendingRequest {
 };
 
 // The implementation for CopresenceManager.
-class CopresenceManagerImpl : public CopresenceManager,
-    public base::SupportsWeakPtr<CopresenceManagerImpl> {
+class CopresenceManagerImpl : public CopresenceManager {
  public:
   virtual ~CopresenceManagerImpl();
   virtual void ExecuteReportRequest(ReportRequest request,
@@ -54,6 +52,8 @@ class CopresenceManagerImpl : public CopresenceManager,
   bool init_failed_;
   std::vector<PendingRequest> pending_requests_queue_;
 
+  base::CancelableCallback<void(bool)> init_callback_;
+
   // TODO(rkc): This code is almost identical to what we use in feedback to
   // perform multiple blocking tasks and then run a post process method. Look
   // into refactoring it all out to a common construct, like maybe a