Consolidate message observer API for win and aura (and touch).

chrome/browser/ui/panels/panel_browser_frame_view.h

Index: chrome/browser/ui/panels/panel_browser_frame_view.h
diff --git a/chrome/browser/ui/panels/panel_browser_frame_view.h b/chrome/browser/ui/panels/panel_browser_frame_view.h
index 00479f87c46770faee4237ea13eaeae6d54c0f6d..d9902bf6aa511f5381cb0f90e57807ab035a7c82 100644
--- a/chrome/browser/ui/panels/panel_browser_frame_view.h
+++ b/chrome/browser/ui/panels/panel_browser_frame_view.h
@@ -107,10 +107,13 @@ class PanelBrowserFrameView : public BrowserNonClientFrameView,
 
     virtual bool IsCursorInViewBounds() const;
 
-  #if defined(OS_WIN)
-    virtual void WillProcessMessage(const MSG& msg) OVERRIDE { }
-    virtual void DidProcessMessage(const MSG& msg) OVERRIDE;
-  #else
+  #if defined(OS_WIN) || defined(TOUCH_UI) || defined(USE_AURA)
+    virtual base::EventStatus WillProcessEvent(
+        const base::NativeEvent& event) OVERRIDE {
+      return base::EVENT_CONTINUE;
+    }
+    virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
+  #elif defined(TOOLKIT_USES_GTK)
     virtual void WillProcessEvent(GdkEvent* event) OVERRIDE { }
     virtual void DidProcessEvent(GdkEvent* event) OVERRIDE;
   #endif