Delete code involving overdraw bottom height.

chrome/android/javatests/src/org/chromium/chrome/browser/compositor/layouts/MockLayoutHost.java

 // 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.
 
 package org.chromium.chrome.browser.compositor.layouts;
 
 import android.content.Context;
 import android.graphics.Rect;
 
 import org.chromium.chrome.browser.compositor.TitleCache;
@@ skipping 46 matching lines @@
     @Override
     public void onSwapBuffersCompleted(int pendingSwapBuffersCount) { }
 
     @Override
     public void onSurfaceCreated() { }
 
     @Override
     public void onPhysicalBackingSizeChanged(int width, int height) { }
 
     @Override
-    public void onOverdrawBottomHeightChanged(int overdrawHeight) {}
-
-    @Override
-    public int getCurrentOverdrawBottomHeight() {
-        return 0;
-    }
-
-    @Override
     public Context getContext() {
         return mContext;
     }
 
     @Override
     public int getWidth() {
         final float density = mContext.getResources().getDisplayMetrics().density;
         final float size = mPortrait ? LAYOUT_HOST_PORTRAIT_WIDTH : LAYOUT_HOST_PORTRAIT_HEIGHT;
         return (int) (density * size);
     }
@@ skipping 72 matching lines @@
 
     @Override
     public float getTopControlsUrlBarAlpha() {
         return 1f;
     }
 
     @Override
     public void hideKeyboard(Runnable postHideTask) {
     }
 }