[ios clean] Move dispatcher out of Browser.

ios/clean/chrome/browser/ui/web_contents/web_coordinator.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/clean/chrome/browser/ui/web_contents/web_coordinator.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #import "ios/clean/chrome/browser/ui/commands/context_menu_commands.h"
 #import "ios/clean/chrome/browser/ui/context_menu/context_menu_context_impl.h"
@@ skipping 46 matching lines @@
 }
 
 - (void)stop {
   [super stop];
   [self.mediator disconnect];
 }
 
 - (void)childCoordinatorDidStart:(BrowserCoordinator*)childCoordinator {
   // Register to receive relevant ContextMenuCommands.
   if ([childCoordinator isKindOfClass:[WebContextMenuCoordinator class]]) {
-    [self.browser->dispatcher()
+    [self.dispatcher
         startDispatchingToTarget:self
                      forSelector:@selector(executeContextMenuScript:)];
-    [self.browser->dispatcher()
-        startDispatchingToTarget:self
-                     forSelector:@selector(openContextMenuImage:)];
+    [self.dispatcher startDispatchingToTarget:self
+                                  forSelector:@selector(openContextMenuImage:)];
   }
   [self.viewController presentViewController:childCoordinator.viewController
                                     animated:YES
                                   completion:nil];
 }
 
 - (void)childCoordinatorWillStop:(BrowserCoordinator*)childCoordinator {
   // Unregister ContextMenuCommands once the UI has been dismissed.
   if ([childCoordinator isKindOfClass:[WebContextMenuCoordinator class]]) {
-    [self.browser->dispatcher()
+    [self.dispatcher
         stopDispatchingForSelector:@selector(executeContextMenuScript:)];
-    [self.browser->dispatcher()
+    [self.dispatcher
         stopDispatchingForSelector:@selector(openContextMenuImage:)];
   }
 }
 
 #pragma mark - ContextMenuCommand
 
 - (void)executeContextMenuScript:(ContextMenuContext*)context {
   ContextMenuContextImpl* contextImpl =
       base::mac::ObjCCastStrict<ContextMenuContextImpl>(context);
   self.webState->ExecuteJavaScript(contextImpl.script);
@@ skipping 13 matching lines @@
   ContextMenuContextImpl* context =
       [[ContextMenuContextImpl alloc] initWithParams:params];
   WebContextMenuCoordinator* contextMenu =
       [[WebContextMenuCoordinator alloc] initWithContext:context];
   [self addChildCoordinator:contextMenu];
   [contextMenu start];
   return YES;
 }
 
 @end