[ARC] Converts parts of ios/web/web_state to ARC.

ios/web/web_state/crw_web_view_proxy_impl.mm

 // Copyright 2013 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/web_state/crw_web_view_proxy_impl.h"
 
 #include "base/ios/ios_util.h"
-#include "base/ios/weak_nsobject.h"
 #include "base/mac/scoped_nsobject.h"
 #import "ios/web/public/web_state/crw_web_view_scroll_view_proxy.h"
 #import "ios/web/public/web_state/ui/crw_content_view.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Returns the first responder in the subviews of |view|, or nil if no view in
 // the subtree is the first responder.
 UIView* GetFirstResponderSubview(UIView* view) {
   if ([view isFirstResponder])
     return view;
 
   for (UIView* subview in [view subviews]) {
     UIView* firstResponder = GetFirstResponderSubview(subview);
@@ skipping 35 matching lines @@
   negativeInsets.top = -insets.top;
   negativeInsets.left = -insets.left;
   negativeInsets.bottom = -insets.bottom;
   negativeInsets.right = -insets.right;
   [self cr_addInsets:negativeInsets];
 }
 
 @end
 
 @implementation CRWWebViewProxyImpl {
-  base::WeakNSObject<CRWContentView> _contentView;
-  base::WeakNSObject<CRWWebController> _webController;
+  __weak CRWWebController* _webController;
   base::scoped_nsobject<NSMutableDictionary> _registeredInsets;
   // The WebViewScrollViewProxy is a wrapper around the web view's
   // UIScrollView to give components access in a limited and controlled manner.
   base::scoped_nsobject<CRWWebViewScrollViewProxy> _contentViewScrollViewProxy;
 }
+@synthesize contentView = _contentView;
 
 - (instancetype)initWithWebController:(CRWWebController*)webController {
   self = [super init];
   if (self) {
     DCHECK(webController);
     _registeredInsets.reset([[NSMutableDictionary alloc] init]);
-    _webController.reset(webController);
+    _webController = webController;
     _contentViewScrollViewProxy.reset([[CRWWebViewScrollViewProxy alloc] init]);
   }
   return self;
 }
 
 - (CRWWebViewScrollViewProxy*)scrollViewProxy {
   return _contentViewScrollViewProxy.get();
 }
 
 - (CGRect)bounds {
@@ skipping 46 matching lines @@
                         forKey:callerValue];
 }
 
 - (void)unregisterInsetsForCaller:(id)caller {
   NSValue* callerValue = [NSValue valueWithNonretainedObject:caller];
   NSValue* insetsValue = [_registeredInsets objectForKey:callerValue];
   [self.scrollViewProxy cr_removeInsets:[insetsValue UIEdgeInsetsValue]];
   [_registeredInsets removeObjectForKey:callerValue];
 }
 
-- (CRWContentView*)contentView {
-  return _contentView.get();
-}
-
 - (void)setContentView:(CRWContentView*)contentView {
-  _contentView.reset(contentView);
+  _contentView = contentView;
   [_contentViewScrollViewProxy setScrollView:contentView.scrollView];
 }
 
 - (void)addSubview:(UIView*)view {
   return [_contentView addSubview:view];
 }
 
 - (BOOL)hasSearchableTextContent {
   return _contentView != nil && [_webController contentIsHTML];
 }
@@ skipping 14 matching lines @@
   UIView* firstResponder = GetFirstResponderSubview(_contentView);
   return firstResponder.inputAssistantItem;
 }
 #endif
 
 - (BOOL)becomeFirstResponder {
   return [_contentView becomeFirstResponder];
 }
 
 @end