Update some #includes in chrome/renderer/extensions/ for headers in the new Platform directory

chrome/renderer/extensions/file_browser_private_custom_bindings.cc

 // Copyright (c) 2012 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 "chrome/renderer/extensions/file_browser_private_custom_bindings.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "grit/renderer_resources.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFileSystem.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebFileSystem.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
 
 namespace {
 
 static v8::Handle<v8::Value> GetLocalFileSystem(
     const v8::Arguments& args) {
   DCHECK(args.Length() == 2);
   DCHECK(args[0]->IsString());
   DCHECK(args[1]->IsString());
   std::string name(*v8::String::Utf8Value(args[0]));
   std::string path(*v8::String::Utf8Value(args[1]));
 
   WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
   DCHECK(webframe);
   return webframe->createFileSystem(
       WebKit::WebFileSystem::TypeExternal,
       WebKit::WebString::fromUTF8(name.c_str()),
       WebKit::WebString::fromUTF8(path.c_str()));
 }
 
 }  // namespace
 
 namespace extensions {
 
 FileBrowserPrivateCustomBindings::FileBrowserPrivateCustomBindings()
     : ChromeV8Extension(NULL) {
   RouteStaticFunction("GetLocalFileSystem", &GetLocalFileSystem);
 }
 
 }  // namespace extensions