ios: Stop using __weak.

ios/net/crn_http_protocol_handler.mm

 // Copyright 2012 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/net/crn_http_protocol_handler.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/mac/bind_objc_block.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 37 matching lines @@
 // Empty callback.
 void DoNothing(bool flag) {}
 
 }  // namespace
 
 // Bridge class to forward NSStream events to the HttpProtocolHandlerCore.
 // Lives on the IO thread.
 @interface CRWHTTPStreamDelegate : NSObject<NSStreamDelegate> {
  @private
   // The object is owned by |_core| and has a weak reference to it.
-  __weak net::HttpProtocolHandlerCore* _core;
+  net::HttpProtocolHandlerCore* _core;  // weak
 }
 - (instancetype)initWithHttpProtocolHandlerCore:
     (net::HttpProtocolHandlerCore*)core;
 // NSStreamDelegate method.
 - (void)stream:(NSStream*)theStream handleEvent:(NSStreamEvent)streamEvent;
 @end
 
 #pragma mark -
 #pragma mark HttpProtocolHandlerCore
 
@@ skipping 1020 matching lines @@
       [[DeferredCancellation alloc] initWithCore:[self getCore]];
   NSArray* modes = @[ [[NSRunLoop currentRunLoop] currentMode] ];
   [cancellation performSelector:@selector(cancel)
                        onThread:[self getClientThread]
                      withObject:nil
                   waitUntilDone:NO
                           modes:modes];
 }
 
 @end