Move lots of GMock stuff out of line.

media/base/mock_task.cc

+// 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 "media/base/mock_task.h"
+
+namespace media {
+
+TaskMocker::TaskMocker()
+    : outstanding_tasks_(0) {
+}
+
+TaskMocker::~TaskMocker() {
+  CHECK(outstanding_tasks_ == 0)
+      << "If outstanding_tasks_ is not zero, tasks have been leaked.";
+}
+
+Task* TaskMocker::CreateTask() {
+  return new CountingTask(this);
+}
+
+}  // namespace media