[iOS] Upstream web_controller_provider_impl.{h,mm}.

ios/public/provider/web/web_controller_provider.mm

Index: ios/public/provider/web/web_controller_provider.mm
diff --git a/ios/public/provider/web/web_controller_provider.mm b/ios/public/provider/web/web_controller_provider.mm
index 1043d93801a6091e4d3c341a00c335b7ca98e8a9..15f09441b79bc025be27f25d10bc8dd0935f2b2c 100644
--- a/ios/public/provider/web/web_controller_provider.mm
+++ b/ios/public/provider/web/web_controller_provider.mm
@@ -10,22 +10,10 @@
 
 namespace ios {
 
-static WebControllerProviderFactory* g_web_controller_provider_factory;
-
-void SetWebControllerProviderFactory(
-    WebControllerProviderFactory* provider_factory) {
-  g_web_controller_provider_factory = provider_factory;
-}
-
-WebControllerProviderFactory* GetWebControllerProviderFactory() {
-  return g_web_controller_provider_factory;
-}
-
 WebControllerProvider::WebControllerProvider(web::BrowserState* browser_state) {
 }
 
-WebControllerProvider::~WebControllerProvider() {
-}
+WebControllerProvider::~WebControllerProvider() {}
 
 bool WebControllerProvider::SuppressesDialogs() const {
   return false;
@@ -42,17 +30,4 @@ void WebControllerProvider::InjectScript(
     completion(nil, nil);
 }
 
-WebControllerProviderFactory::WebControllerProviderFactory() {
-}
-
-WebControllerProviderFactory::~WebControllerProviderFactory() {
-}
-
-std::unique_ptr<WebControllerProvider>
-WebControllerProviderFactory::CreateWebControllerProvider(
-    web::BrowserState* browser_state) {
-  return std::unique_ptr<WebControllerProvider>(
-      new WebControllerProvider(browser_state));
-}
-
 }  // namespace ios