content: Cleanup class/struct forward declarations

content/browser/renderer_host/text_input_manager.h

 // Copyright 2016 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_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__
 #define CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__
 
 #include <unordered_map>
 #include <utility>
 
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "content/common/text_input_state.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/range/range.h"
 #include "ui/gfx/selection_bound.h"
 
 struct ViewHostMsg_SelectionBounds_Params;
 
 namespace content {
 
 class RenderWidgetHostImpl;
-class RenderWidgetHostView;
 class RenderWidgetHostViewBase;
 
 // A class which receives updates of TextInputState from multiple sources and
 // decides what the new TextInputState is. It also notifies the observers when
 // text input state is updated.
 class CONTENT_EXPORT TextInputManager {
  public:
   // The tab's top-level RWHV should be an observer of TextInputManager to get
   // notifications about changes in TextInputState or other IME related state
   // for child frames.
@@ skipping 198 matching lines @@
   ViewMap<CompositionRangeInfo> composition_range_info_map_;
   ViewMap<TextSelection> text_selection_map_;
 
   base::ObserverList<Observer> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TextInputManager);
 };
 }
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_MANAGER_H__