Introduce NetworkDelegate's implementation in extensions.

extensions/shell/browser/shell_browser_context.h

Index: extensions/shell/browser/shell_browser_context.h
diff --git a/extensions/shell/browser/shell_browser_context.h b/extensions/shell/browser/shell_browser_context.h
index 305ab2b763b70b0a991ce73de894be6715c3612e..4ec90783910159b6fc08a7e8e3ac863e6093f653 100644
--- a/extensions/shell/browser/shell_browser_context.h
+++ b/extensions/shell/browser/shell_browser_context.h
@@ -10,21 +10,31 @@
 #include "content/shell/browser/shell_browser_context.h"
 #include "storage/browser/quota/special_storage_policy.h"
 
+namespace net {
+class NetLog;
+}
+
 namespace extensions {
 
+class InfoMap;
 class ShellSpecialStoragePolicy;
 
 // The BrowserContext used by the content, apps and extensions systems in
 // app_shell.
 class ShellBrowserContext : public content::ShellBrowserContext {
  public:
-  ShellBrowserContext();
+  explicit ShellBrowserContext(net::NetLog* net_log);
   virtual ~ShellBrowserContext();
 
   // content::BrowserContext implementation.
   virtual content::BrowserPluginGuestManager* GetGuestManager() OVERRIDE;
   virtual storage::SpecialStoragePolicy* GetSpecialStoragePolicy() OVERRIDE;
 
+  net::URLRequestContextGetter* CreateRequestContext(
+      content::ProtocolHandlerMap* protocol_handlers,
+      content::URLRequestInterceptorScopedVector request_interceptors,
+      InfoMap* extension_info_map);
+
   // HACK: Pad the virtual function table so we trip an assertion if someone
   // tries to use |this| as a Profile.
   virtual void ProfileFunctionCallOnNonProfileBrowserContext1();
@@ -44,7 +54,12 @@ class ShellBrowserContext : public content::ShellBrowserContext {
   virtual void ProfileFunctionCallOnNonProfileBrowserContext15();
 
  private:
+  void Init();
+  void InitializationOnIOThread();
+  net::NetLog* net_log_;
+  bool ignore_certificate_errors_;
   scoped_refptr<storage::SpecialStoragePolicy> storage_policy_;
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellBrowserContext);
 };