Fix header guard in cc/surfaces/display

cc/surfaces/display.cc

Index: cc/surfaces/display.cc
diff --git a/cc/surfaces/display.cc b/cc/surfaces/display.cc
index 1099c3ec567a9b33482c70ad38d46d2095e2b15e..86d97089eebcd4d6700a6e88435b3ff86c826ab0 100644
--- a/cc/surfaces/display.cc
+++ b/cc/surfaces/display.cc
@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CC_SURFACES_DISPLAY_H_
-#define CC_SURFACES_DISPLAY_H_
-
 #include "cc/surfaces/display.h"
 
 #include "base/message_loop/message_loop.h"
@@ -111,5 +108,3 @@ void Display::ReturnResources(const ReturnedResourceArray& resources) {
 }
 
 }  // namespace cc
-
-#endif  // CC_SURFACES_DISPLAY_H_