Delete code involving overdraw bottom height.

chrome/browser/android/compositor/compositor_view.cc

Index: chrome/browser/android/compositor/compositor_view.cc
diff --git a/chrome/browser/android/compositor/compositor_view.cc b/chrome/browser/android/compositor/compositor_view.cc
index 2f94e8386e755c4d17e5ed4d40193bae5053c27d..69580802f389cc954c9c8ee991c79ef5aca21126 100644
--- a/chrome/browser/android/compositor/compositor_view.cc
+++ b/chrome/browser/android/compositor/compositor_view.cc
@@ -88,7 +88,6 @@ CompositorView::CompositorView(JNIEnv* env,
       current_surface_format_(0),
       content_width_(0),
       content_height_(0),
-      overdraw_bottom_height_(0),
       overlay_video_mode_(false),
       empty_background_color_(empty_background_color),
       weak_factory_(this) {
@@ -187,9 +186,7 @@ void CompositorView::SetLayoutViewport(JNIEnv* env,
                                        jfloat height,
                                        jfloat visible_x_offset,
                                        jfloat visible_y_offset,
-                                       jfloat overdraw_bottom_height,
                                        jfloat dp_to_pixel) {
-  overdraw_bottom_height_ = overdraw_bottom_height;
   compositor_->setDeviceScaleFactor(dp_to_pixel);
   root_layer_->SetBounds(gfx::Size(content_width_, content_height_));
 }
@@ -245,10 +242,6 @@ void CompositorView::SetSceneLayer(JNIEnv* env,
   }
 }
 
-int CompositorView::GetUsableContentHeight() {
-  return std::max(content_height_ - overdraw_bottom_height_, 0);
-}
-
 void CompositorView::UpdateToolbarLayer(JNIEnv* env,
                                         const JavaParamRef<jobject>& object,
                                         jint toolbar_resource_id,