Move EmptyString, kWhitespace and the BOM to base.

chrome_frame/chrome_active_document.cc

 // Copyright (c) 2011 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.
 
 // Implementation of ChromeActiveDocument
 #include "chrome_frame/chrome_active_document.h"
 
 #include <hlink.h>
 #include <htiface.h>
 #include <initguid.h>
@@ skipping 234 matching lines @@
     url = GetActualUrlFromMoniker(moniker_name, bind_context,
                                   mgr ? mgr->url(): std::wstring());
   }
 
   ChromeFrameUrl cf_url;
   if (!cf_url.Parse(url)) {
     DLOG(WARNING) << __FUNCTION__ << " Failed to parse url:" << url;
     return E_INVALIDARG;
   }
 
-  std::string referrer(mgr ? mgr->referrer() : EmptyString());
+  std::string referrer(mgr ? mgr->referrer() : std::string());
   RendererType renderer_type = cf_url.is_chrome_protocol() ?
       RENDERER_TYPE_CHROME_GCF_PROTOCOL : RENDERER_TYPE_UNDETERMINED;
 
   // With CTransaction patch we have more robust way to grab the referrer for
   // each top-level-switch-to-CF request by peeking at our sniffing data
   // object that lives inside the bind context.  We also remember the reason
   // we're rendering the document in Chrome.
   if (g_patch_helper.state() == PatchHelper::PATCH_PROTOCOL && info) {
     scoped_refptr<ProtData> prot_data = info->get_prot_data();
     if (prot_data) {
@@ skipping 126 matching lines @@
   DWORD bytes_read = 0;
   stream->Read(url_bstr.AllocateBytes(url_size), url_size, &bytes_read);
   std::wstring url(url_bstr);
 
   ChromeFrameUrl cf_url;
   if (!cf_url.Parse(url)) {
     DLOG(WARNING) << __FUNCTION__ << " Failed to parse url:" << url;
     return E_INVALIDARG;
   }
 
-  const std::string& referrer = EmptyString();
-  if (!LaunchUrl(cf_url, referrer)) {
+  if (!LaunchUrl(cf_url, std::string())) {
     NOTREACHED() << __FUNCTION__ << " Failed to launch url:" << url;
     return E_INVALIDARG;
   }
   return S_OK;
 }
 
 STDMETHODIMP ChromeActiveDocument::SaveHistory(IStream* stream) {
   // TODO(sanjeevr): We need to fetch the entire list of navigation entries
   // from Chrome and persist it in the stream. And in LoadHistory we need to
   // pass this list back to Chrome which will recreate the list. This will allow
@@ skipping 1017 matching lines @@
 
   return false;
 }
 
 bool ChromeActiveDocument::IsFirstNavigation(
     const NavigationInfo& new_navigation_info) const {
   return (navigation_info_->url.is_empty() &&
           new_navigation_info.navigation_type ==
               content::NAVIGATION_TYPE_NEW_PAGE);
 }