Get rid of ipc_sender.h include in ipc_message.h.

content/public/test/render_view_fake_resources_test.h

 // Copyright (c) 2012 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.
 //
 // RenderViewFakeResourcesTest can be used as a base class for tests that need
 // to simulate loading network resources (such as http: urls) into a
 // RenderView.  It does this by handling the relevant IPC messages that the
 // renderer would normally send to the browser, and responding with static
 // content from an internal map.  A request for a url that is not in the map
 // will return a 404.  Currently, content is always returned as text/html, and
@@ skipping 36 matching lines @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/public/renderer/render_view_visitor.h"
 #include "ipc/ipc_listener.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 struct ResourceHostMsg_Request;
 
+namespace IPC {
+class Channel;
+}
+
 namespace WebKit {
 class WebFrame;
 class WebHistoryItem;
 }
 
 namespace content {
 class MockRenderProcess;
 class RenderThreadImpl;
 
 class RenderViewFakeResourcesTest : public ::testing::Test,
@@ skipping 76 matching lines @@
   // The previous state for whether sandbox support was enabled in
   // RenderViewWebKitPlatformSupportImpl.
   bool sandbox_was_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewFakeResourcesTest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_RENDER_VIEW_FAKE_RESOURCES_TEST_H_