[GCM] Fix crash during connection races

google_apis/gcm/engine/fake_connection_handler.cc

Index: google_apis/gcm/engine/fake_connection_handler.cc
diff --git a/google_apis/gcm/engine/fake_connection_handler.cc b/google_apis/gcm/engine/fake_connection_handler.cc
index dbffbcea0608a9e2454e7212468bba8075cd8578..243c28068492a345ccab779dec14d2161891d128 100644
--- a/google_apis/gcm/engine/fake_connection_handler.cc
+++ b/google_apis/gcm/engine/fake_connection_handler.cc
@@ -32,7 +32,8 @@ FakeConnectionHandler::FakeConnectionHandler(
       write_callback_(write_callback),
       fail_login_(false),
       fail_send_(false),
-      initialized_(false) {
+      initialized_(false),
+      had_error_(false) {
 }
 
 FakeConnectionHandler::~FakeConnectionHandler() {
@@ -51,10 +52,11 @@ void FakeConnectionHandler::Init(const mcs_proto::LoginRequest& login_request,
 
 void FakeConnectionHandler::Reset() {
   initialized_ = false;
+  had_error_ = false;
 }
 
 bool FakeConnectionHandler::CanSendMessage() const {
-  return initialized_;
+  return initialized_ && !had_error_;
 }
 
 void FakeConnectionHandler::SendMessage(