Structural improvements for request handling (issue #1044)

- Add new CefRequestContext and CefRequestContextHandler classes.
- Add CefRequestContext argument to CefBrowserHost static factory methods.
- Move GetCookieManager from CefRequestHandler to CefRequestContextHandler.
- Use BrowserContext as the root proxy object for network requests.
- Move accessors for CefBrowserMainParts members from CefContext to CefContentBrowserClient.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1424 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/url_request_context_getter_proxy.cc

@@ -8,12 +8,11 @@
 #include "libcef/browser/url_request_context_proxy.h"
 
 CefURLRequestContextGetterProxy::CefURLRequestContextGetterProxy(
-    CefBrowserHostImpl* browser,
+    CefRefPtr<CefRequestContextHandler> handler,
     CefURLRequestContextGetter* parent)
-    : browser_(browser),
+    : handler_(handler),
       parent_(parent),
       context_proxy_(NULL) {
-  DCHECK(browser);
   DCHECK(parent);
 }
 
@@ -28,7 +27,7 @@ net::URLRequestContext*
   CEF_REQUIRE_IOT();
   if (!context_proxy_) {
     context_proxy_ = parent_->CreateURLRequestContextProxy();
-    context_proxy_->Initialize(browser_);
+    context_proxy_->Initialize(handler_);
   }
   return context_proxy_;
 }
@@ -37,3 +36,7 @@ scoped_refptr<base::SingleThreadTaskRunner>
     CefURLRequestContextGetterProxy::GetNetworkTaskRunner() const {
   return parent_->GetNetworkTaskRunner();
 }
+
+net::HostResolver* CefURLRequestContextGetterProxy::GetHostResolver() const {
+  return parent_->host_resolver();
+}