Delete code involving overdraw bottom height.

chrome/browser/android/compositor/compositor_view.h

 // Copyright 2015 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 CHROME_BROWSER_ANDROID_COMPOSITOR_COMPOSITOR_VIEW_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_COMPOSITOR_VIEW_H_
 
 #include <jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 63 matching lines @@
   void FinalizeLayers(JNIEnv* env,
                       const base::android::JavaParamRef<jobject>& jobj);
   void SetLayoutViewport(JNIEnv* env,
                          const base::android::JavaParamRef<jobject>& object,
                          jfloat x,
                          jfloat y,
                          jfloat width,
                          jfloat height,
                          jfloat visible_x_offset,
                          jfloat visible_y_offset,
-                         jfloat overdraw_bottom_height,
                          jfloat dp_to_pixel);
   void UpdateToolbarLayer(JNIEnv* env,
                           const base::android::JavaParamRef<jobject>& object,
                           jint toolbar_resource_id,
                           jint toolbar_background_color,
                           jint url_bar_resource_id,
                           jfloat url_bar_alpha,
                           jfloat top_offset,
                           jfloat brightness,
                           bool visible,
@@ skipping 38 matching lines @@
   ~CompositorView() override;
 
   // content::BrowserChildProcessObserver implementation:
   void BrowserChildProcessHostDisconnected(
       const content::ChildProcessData& data) override;
   void BrowserChildProcessCrashed(const content::ChildProcessData& data,
                                   int exit_code) override;
 
   void SetBackground(bool visible, SkColor color);
 
-  int GetUsableContentHeight();
-
   base::android::ScopedJavaGlobalRef<jobject> obj_;
   scoped_ptr<content::Compositor> compositor_;
   LayerTitleCache* layer_title_cache_;
   TabContentManager* tab_content_manager_;
 
   scoped_refptr<cc::SolidColorLayer> root_layer_;
   scoped_refptr<ToolbarLayer> toolbar_layer_;
   SceneLayer* scene_layer_;
   scoped_refptr<cc::Layer> scene_layer_layer_;
 
   int current_surface_format_;
   int content_width_;
   int content_height_;
-  int overdraw_bottom_height_;
   bool overlay_video_mode_;
   SkColor empty_background_color_;
 
   base::WeakPtrFactory<CompositorView> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorView);
 };
 
 bool RegisterCompositorView(JNIEnv* env);
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_COMPOSITOR_VIEW_H_