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

ui/wm/core/masked_window_targeter.h

Index: ui/wm/core/masked_window_targeter.h
diff --git a/ui/wm/core/masked_window_targeter.h b/ui/wm/core/masked_window_targeter.h
index 846021a6baad0ac3f51e25f89db58933c769a8a4..46cf4d272d4cbcc0bd4a3470805f7e114024d6ae 100644
--- a/ui/wm/core/masked_window_targeter.h
+++ b/ui/wm/core/masked_window_targeter.h
@@ -6,7 +6,7 @@
 #define UI_WM_CORE_MASKED_WINDOW_TARGETER_H_
 
 #include "ui/aura/window_targeter.h"
-#include "ui/wm/core/wm_core_export.h"
+#include "ui/wm/wm_export.h"
 
 namespace gfx {
 class Path;
@@ -14,7 +14,7 @@ class Path;
 
 namespace wm {
 
-class WM_CORE_EXPORT MaskedWindowTargeter : public aura::WindowTargeter {
+class WM_EXPORT MaskedWindowTargeter : public aura::WindowTargeter {
  public:
   explicit MaskedWindowTargeter(aura::Window* masked_window);
   virtual ~MaskedWindowTargeter();