Revert of Rename wm_core_export.h to wm_export.h and the wm_core target to just wm

ui/wm/core/shadow.h

 // 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.
 
 #ifndef UI_WM_CORE_SHADOW_H_
 #define UI_WM_CORE_SHADOW_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/gfx/rect.h"
-#include "ui/wm/wm_export.h"
+#include "ui/wm/core/wm_core_export.h"
 
 namespace ui {
 class Layer;
 }  // namespace ui
 
 namespace wm {
 
 class ImageGrid;
 
 // Simple class that draws a drop shadow around content at given bounds.
-class WM_EXPORT Shadow : public ui::ImplicitAnimationObserver {
+class WM_CORE_EXPORT Shadow : public ui::ImplicitAnimationObserver {
  public:
   enum Style {
     // Active windows have more opaque shadows, shifted down to make the window
     // appear "higher".
     STYLE_ACTIVE,
 
     // Inactive windows have less opaque shadows.
     STYLE_INACTIVE,
 
     // Small windows like tooltips and context menus have lighter, smaller
@@ skipping 43 matching lines @@
   // The interior inset of the shadow images. The content bounds of the image
   // grid should be set to |content_bounds_| inset by this amount.
   int interior_inset_;
 
   DISALLOW_COPY_AND_ASSIGN(Shadow);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_SHADOW_H_