Fixes bug in MultiWindowResizeController where it wasn't removing

ash/wm/workspace/multi_window_resize_controller_unittest.cc

 // Copyright (c) 2012 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/workspace/multi_window_resize_controller.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/workspace_controller.h"
@@ skipping 228 matching lines @@
   EXPECT_TRUE(IsShowing());
   EXPECT_FALSE(HasPendingHide());
 
   // w3 should be picked up when resize is started.
   gfx::Rect bounds(resize_widget()->GetWindowBoundsInScreen());
   generator.MoveMouseTo(bounds.x() + 1, bounds.y() + 1);
   generator.PressLeftButton();
   generator.MoveMouseTo(bounds.x() + 11, bounds.y() + 10);
 
   EXPECT_TRUE(HasTarget(w3.get()));
+
+  // Release the mouse. The resizer should still be visible and a subsequent
+  // press should not trigger a DCHECK.
+  generator.ReleaseLeftButton();
+  EXPECT_TRUE(IsShowing());
+  generator.PressLeftButton();
 }
-
 }  // namespace internal
 }  // namespace ash