Fix clipping by using the correct window styles for native buttons.

Also ensure unhandled messages get handled by DefWindowProc of the containing WidgetWin.

http://crbug.com/9216

Review URL: http://codereview.chromium.org/42629

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12671 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/views/controls/button/native_button_win.h b/chrome/views/controls/button/native_button_win.h
index 5a9044b..0a1a572 100644
--- a/chrome/views/controls/button/native_button_win.h
+++ b/chrome/views/controls/button/native_button_win.h
@@ -29,9 +29,10 @@
   virtual gfx::Size GetPreferredSize();
 
   // Overridden from NativeControlWin:
-  virtual LRESULT ProcessMessage(UINT message,
-                                 WPARAM w_param,
-                                 LPARAM l_param);
+  virtual bool ProcessMessage(UINT message,
+                              WPARAM w_param,
+                              LPARAM l_param,
+                              LRESULT* result);
   virtual bool OnKeyDown(int vkey);
 
  protected:
@@ -65,9 +66,10 @@
 
   // Overridden from NativeControlWin:
   virtual void SetFocus();
-  virtual LRESULT ProcessMessage(UINT message,
-                                 WPARAM w_param,
-                                 LPARAM l_param);
+  virtual bool ProcessMessage(UINT message,
+                              WPARAM w_param,
+                              LPARAM l_param,
+                              LRESULT* result);
 
  protected:
   virtual void CreateNativeControl();