Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/overview_window_targeter.cc

Index: ash/wm/overview/overview_window_targeter.cc
diff --git a/ash/wm/overview/overview_window_targeter.cc b/ash/wm/overview/overview_window_targeter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0fa04ce8d65374220dd6608a2f5ba547552b4b4c
--- /dev/null
+++ b/ash/wm/overview/overview_window_targeter.cc
@@ -0,0 +1,32 @@
+// 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.
+
+#include "ash/wm/overview/overview_window_targeter.h"
+#include "ui/aura/window.h"
+
+namespace ash {
+
+OverviewWindowTargeter::OverviewWindowTargeter(aura::Window* target)
+    : bounds_(gfx::Rect()), target_(target) {
+}
+
+OverviewWindowTargeter::~OverviewWindowTargeter() {
+}
+
+ui::EventTarget* OverviewWindowTargeter::FindTargetForLocatedEvent(
+    ui::EventTarget* target,
+    ui::LocatedEvent* event) {
+  // Manually override the location of the event to make sure it targets the
+  // contents view on the target window.
+  event->set_location(gfx::PointF(0, 0));
+  return target_;
+}
+
+bool OverviewWindowTargeter::EventLocationInsideBounds(
+    ui::EventTarget* target,
+    const ui::LocatedEvent& event) const {
+  return bounds_.Contains(event.location());
+}
+
+}  // namespace ash