[ObjC ARC] Converts the rest of ios/web to ARC.

ios/web/web_state/web_state_delegate_bridge.mm

 // Copyright 2016 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.
 
 #import "ios/web/public/web_state/web_state_delegate_bridge.h"
 
 #include "base/logging.h"
 #import "ios/web/public/web_state/context_menu_params.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace web {
 
 WebStateDelegateBridge::WebStateDelegateBridge(id<CRWWebStateDelegate> delegate)
     : delegate_(delegate) {}
 
 WebStateDelegateBridge::~WebStateDelegateBridge() {}
 
 void WebStateDelegateBridge::LoadProgressChanged(WebState* source,
                                                  double progress) {
   if ([delegate_ respondsToSelector:@selector(webState:didChangeProgress:)])
@@ skipping 11 matching lines @@
 
 JavaScriptDialogPresenter* WebStateDelegateBridge::GetJavaScriptDialogPresenter(
     WebState* source) {
   SEL selector = @selector(javaScriptDialogPresenterForWebState:);
   if ([delegate_ respondsToSelector:selector]) {
     return [delegate_ javaScriptDialogPresenterForWebState:source];
   }
   return nullptr;
 }
 
-}  // web
+}  // web