Move a bunch of child-only code from content/common to content/child

content/common/child_resource_message_filter.h

Index: content/common/child_resource_message_filter.h
diff --git a/content/common/child_resource_message_filter.h b/content/common/child_resource_message_filter.h
deleted file mode 100644
index 5fa39b5c07ea802e11d34c93b5286522b66a43a3..0000000000000000000000000000000000000000
--- a/content/common/child_resource_message_filter.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright 2013 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.
-
-#ifndef CONTENT_COMMON_CHILD_RESOURCE_MESSAGE_FILTER_H_
-#define CONTENT_COMMON_CHILD_RESOURCE_MESSAGE_FILTER_H_
-
-#include "base/memory/ref_counted.h"
-#include "ipc/ipc_channel_proxy.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace content {
-class ResourceDispatcher;
-
-// Supplies ResourceDispatcher with timestamps for some resource messages.
-//
-// Background: ResourceDispatcher converts browser process time to child
-// process time. This is done to achieve coherent timeline. Conversion is
-// a linear transformation such that given browser process time range is
-// mapped to corresponding child process time range. Timestamps for child
-// process time range should be taken by IO thread when resource messages
-// arrive. Otherwise, timestamps may be affected by long rendering / JS task.
-//
-// When specific message is processed by this filter, new task charged
-// with timestamp is posted to main thread. This task is processed just before
-// resource message and invokes ResourceDispatcher::set_io_timestamp.
-class ChildResourceMessageFilter : public IPC::ChannelProxy::MessageFilter {
- public:
-  explicit ChildResourceMessageFilter(ResourceDispatcher* resource_dispatcher);
-
-  // IPC::ChannelProxy::MessageFilter implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
- private:
-  virtual ~ChildResourceMessageFilter();
-
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
-  ResourceDispatcher* resource_dispatcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChildResourceMessageFilter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_CHILD_RESOURCE_MESSAGE_FILTER_H_