app_list: Fix shadow bleeds over launcher button and steals mouse events

content/browser/web_contents/web_contents_view_aura.cc

Index: content/browser/web_contents/web_contents_view_aura.cc
diff --git a/content/browser/web_contents/web_contents_view_aura.cc b/content/browser/web_contents/web_contents_view_aura.cc
index 101e58b31e96cbb83321febfd26c845ac705f772..ef10a8e77aaffb92acc670b705160d4fc2b5fa62 100644
--- a/content/browser/web_contents/web_contents_view_aura.cc
+++ b/content/browser/web_contents/web_contents_view_aura.cc
@@ -323,7 +323,6 @@ void WebContentsViewAura::SizeContents(const gfx::Size& size) {
     // Our size matches what we want but the renderers size may not match.
     // Pretend we were resized so that the renderers size is updated too.
     SizeChangedCommon(size);
-
   }
 }
 
@@ -558,6 +557,14 @@ void WebContentsViewAura::OnWindowVisibilityChanged(bool visible) {
   else
     web_contents_->HideContents();
 }
+
+bool WebContentsViewAura::HasHitTestMask() const {
+  return false;
+}
+
+void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, aura::client::DragDropDelegate implementation: