ash: Minor cleanup, move more files from launcher to shelf.

ash/shelf/overflow_button.h

Index: ash/shelf/overflow_button.h
diff --git a/ash/launcher/overflow_button.h b/ash/shelf/overflow_button.h
similarity index 90%
rename from ash/launcher/overflow_button.h
rename to ash/shelf/overflow_button.h
index 0b225aaa29ef499051248743a73ed5e6e22447ab..3390109a40b35af7e82f42b94a608f08f2dd0791 100644
--- a/ash/launcher/overflow_button.h
+++ b/ash/shelf/overflow_button.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_LAUNCHER_OVERFLOW_BUTTON_H_
-#define ASH_LAUNCHER_OVERFLOW_BUTTON_H_
+#ifndef ASH_SHELF_OVERFLOW_BUTTON_H_
+#define ASH_SHELF_OVERFLOW_BUTTON_H_
 
 #include "ash/shelf/shelf_types.h"
 #include "base/basictypes.h"
@@ -41,4 +41,4 @@ class OverflowButton : public views::CustomButton {
 }  // namespace internal
 }  // namespace ash
 
-#endif  // ASH_LAUNCHER_OVERFLOW_BUTTON_H_
+#endif  // ASH_SHELF_OVERFLOW_BUTTON_H_