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

ui/wm/core/focus_controller.h

Index: ui/wm/core/focus_controller.h
diff --git a/ui/wm/core/focus_controller.h b/ui/wm/core/focus_controller.h
index 3366ea0c18f63d6d14a3da01f91610b435f85dda..fecdd2e3292126c24a56accbd74b1ddceb145bb9 100644
--- a/ui/wm/core/focus_controller.h
+++ b/ui/wm/core/focus_controller.h
@@ -12,8 +12,8 @@
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
+#include "ui/wm/core/wm_core_export.h"
 #include "ui/wm/public/activation_client.h"
-#include "ui/wm/wm_export.h"
 
 namespace wm {
 
@@ -34,10 +34,10 @@
 // . Window disposition changes (implemented here in aura::WindowObserver).
 //   (The FocusController registers itself as an observer of the active and
 //    focused windows).
-class WM_EXPORT FocusController : public aura::client::ActivationClient,
-                                  public aura::client::FocusClient,
-                                  public ui::EventHandler,
-                                  public aura::WindowObserver {
+class WM_CORE_EXPORT FocusController : public aura::client::ActivationClient,
+                                       public aura::client::FocusClient,
+                                       public ui::EventHandler,
+                                       public aura::WindowObserver {
  public:
   // |rules| cannot be NULL.
   explicit FocusController(FocusRules* rules);