Move lots of GMock stuff out of line.

chrome/common/notification_observer_mock.cc

Index: chrome/common/notification_observer_mock.cc
diff --git a/chrome/common/notification_observer_mock.cc b/chrome/common/notification_observer_mock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..634afa539074d6531af1ea03675746cfa913eff3
--- /dev/null
+++ b/chrome/common/notification_observer_mock.cc
@@ -0,0 +1,12 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/common/notification_observer_mock.h"
+
+#include "chrome/common/notification_details.h"
+#include "chrome/common/notification_source.h"
+
+NotificationObserverMock::NotificationObserverMock() {}
+
+NotificationObserverMock::~NotificationObserverMock() {}