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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index a2a36082571fec8a24ff03770f24db2b83eacf6a..c4b9f7168cc466df1f7b40cb346b44dc01a78a8c 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -142,7 +142,7 @@ bool ShouldSendPinchGesture() {
 // RenderWidgetHostViewAura.
 class RenderWidgetHostViewAura::WindowObserver : public aura::WindowObserver {
  public:
-  WindowObserver(RenderWidgetHostViewAura* view) : view_(view) {}
+  explicit WindowObserver(RenderWidgetHostViewAura* view) : view_(view) {}
   virtual ~WindowObserver() {}
 
     // Overridden from aura::WindowObserver:
@@ -156,8 +156,8 @@ class RenderWidgetHostViewAura::WindowObserver : public aura::WindowObserver {
   DISALLOW_COPY_AND_ASSIGN(WindowObserver);
 };
 
-class RenderWidgetHostViewAura::ResizeLock :
-    public base::SupportsWeakPtr<RenderWidgetHostViewAura::ResizeLock> {
+class RenderWidgetHostViewAura::ResizeLock
+    : public base::SupportsWeakPtr<RenderWidgetHostViewAura::ResizeLock> {
  public:
   ResizeLock(aura::RootWindow* root_window, const gfx::Size new_size)
       : root_window_(root_window),
@@ -1168,6 +1168,13 @@ void RenderWidgetHostViewAura::OnWindowDestroyed() {
 void RenderWidgetHostViewAura::OnWindowVisibilityChanged(bool visible) {
 }
 
+bool RenderWidgetHostViewAura::HasHitTestMask() const {
+  return false;
+}
+
+void RenderWidgetHostViewAura::GetHitTestMask(gfx::Path* mask) const {
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, aura::client::ActivationDelegate implementation: