Also scan .m and .mm files in checkdeps.py

webkit/tools/test_shell/test_shell_mac.mm

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 #import <objc/objc-runtime.h>
 #include <sys/stat.h>
 
 #include "webkit/tools/test_shell/test_shell.h"
@@ skipping 24 matching lines @@
 #include "webkit/glue/webpreferences.h"
 #include "webkit/glue/weburlrequest.h"
 #include "webkit/glue/webview.h"
 #include "webkit/glue/webwidget.h"
 #include "webkit/glue/plugins/plugin_list.h"
 #include "webkit/tools/test_shell/mac/test_shell_webview.h"
 #include "webkit/tools/test_shell/resource.h"
 #include "webkit/tools/test_shell/simple_resource_loader_bridge.h"
 #include "webkit/tools/test_shell/test_navigation_controller.h"
 
-#import "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
 #import "mac/DumpRenderTreePasteboard.h"
 
 #define MAX_LOADSTRING 100
 
 // Sizes for URL bar layout
 #define BUTTON_HEIGHT 22
 #define BUTTON_WIDTH 72
 #define BUTTON_MARGIN 8
 #define URLBAR_HEIGHT  32
@@ skipping 654 matching lines @@
   return false;
 }
 
 void DidLoadPlugin(const std::string& filename) {
 }
 
 void DidUnloadPlugin(const std::string& filename) {
 }
 
 }  // namespace webkit_glue