[ObjC ARC] Converts ios/chrome/browser/ui:ui_internal to ARC.

ios/chrome/browser/ui/browser_view_controller.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_BROWSER_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_BROWSER_VIEW_CONTROLLER_H_
 
 #import <MessageUI/MessageUI.h>
 #import <StoreKit/StoreKit.h>
 #import <UIKit/UIKit.h>
@@ skipping 54 matching lines @@
                dependencyFactory:
                    (BrowserViewControllerDependencyFactory*)factory
     NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)initWithNibName:(NSString*)nibNameOrNil
                          bundle:(NSBundle*)nibBundleOrNil NS_UNAVAILABLE;
 
 - (instancetype)initWithCoder:(NSCoder*)aDecoder NS_UNAVAILABLE;
 
 // The top-level browser container view.
-@property(nonatomic, retain) BrowserContainerView* contentArea;
+@property(nonatomic, strong) BrowserContainerView* contentArea;
 
 // Invisible button used to dismiss the keyboard.
-@property(nonatomic, retain) UIButton* typingShield;
+@property(nonatomic, strong) UIButton* typingShield;
 
 // Activates/deactivates the object. This will enable/disable the ability for
 // this object to browse, and to have live UIWebViews associated with it. While
 // not active, the UI will not react to changes in the tab model, so generally
 // an inactive BVC should not be visible.
 @property(nonatomic, assign, getter=isActive) BOOL active;
 
 // Returns whether or not text to speech is playing.
 @property(nonatomic, assign, readonly, getter=isPlayingTTS) BOOL playingTTS;
 
 // Returns the TabModel passed to the initializer.
-@property(nonatomic, assign, readonly) TabModel* tabModel;
+@property(nonatomic, weak, readonly) TabModel* tabModel;
 
 // Returns the ios::ChromeBrowserState passed to the initializer.
 @property(nonatomic, assign, readonly) ios::ChromeBrowserState* browserState;
 
 // Whether the receiver is currently the primary BVC.
 - (void)setPrimary:(BOOL)primary;
 
 // Called when the typing shield is tapped.
 - (void)shieldWasTapped:(id)sender;
 
@@ skipping 50 matching lines @@
 
 // Removes files received from other applications. If |immediately| is YES,
 // initiates the removal of files immediately. |completionHandler| is called
 // when files have been removed.
 - (void)removeExternalFilesImmediately:(BOOL)immediately
                      completionHandler:(ProceduralBlock)completionHandler;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_BROWSER_VIEW_CONTROLLER_H_