libcef: Update due to underlying chromium changes.

- External plugin loading support is now provided by webkit/glue/plugins so the libcef/plugins directory has been eliminated, with related changes.
- Modify the CefPluginInfo structure to use a more friendly data organization format.
- Remove CefUnregisterPlugin() as it is no longer functional.
- WebViewDelegate::ShowContextMenu() now receives the menu type as a bit-masked flag, so adjust the API accordingly.
- WebViewDelegate::GetContainingView() now returns a gfx::NativeViewId instead of a gfx::NativeView.
- Modify BrowserRequestContext because GetUserAgent() is now a virtual method of URLRequestContext.
- The data buffer in RequestProxy is now a net::IOBuffer.
- Add webkit_glue::GetScreenInfo().

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@10 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser_request_context.cc

@@ -27,8 +27,6 @@ void BrowserRequestContext::Init(
     bool no_proxy) {
   cookie_store_ = new net::CookieMonster();
 
-  user_agent_ = webkit_glue::GetUserAgent();
-
   // hard-code A-L and A-C for test shells
   accept_language_ = "en-us,en";
   accept_charset_ = "iso-8859-1,*,utf-8";
@@ -53,3 +51,7 @@ BrowserRequestContext::~BrowserRequestContext() {
   delete proxy_service_;
 }
 
+const std::string& BrowserRequestContext::GetUserAgent(
+    const GURL& url) const {
+  return webkit_glue::GetUserAgent(url);
+}