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

ios/chrome/browser/ui/fullscreen_controller.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/chrome/browser/ui/fullscreen_controller.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 
@@ skipping 57 matching lines @@
   // UI is displayed.
   BOOL overscrollActionsInProgress_;
   // Counter used to keep track of the number of actions currently disabling
   // full screen.
   uint fullScreenLock_;
   // CRWWebViewProxy object allows web view manipulations.
   id<CRWWebViewProxy> webViewProxy_;
 }
 
 // Access to the UIWebView's UIScrollView.
-@property(unsafe_unretained, nonatomic, readonly)
-    CRWWebViewScrollViewProxy* scrollViewProxy;
+@property(weak, nonatomic, readonly) CRWWebViewScrollViewProxy* scrollViewProxy;
 // The navigation controller of the page.
 @property(nonatomic, readonly, assign) NavigationManager* navigationManager;
 // The gesture recognizer set on the scrollview to detect tap. Must be readwrite
 // for property releaser to work.
 @property(nonatomic, readwrite, strong)
     UITapGestureRecognizer* userInteractionGestureRecognizer;
 // The delegate responsible for providing the header height and moving the
 // header.
-@property(unsafe_unretained, nonatomic, readonly)
-    id<FullScreenControllerDelegate>
-        delegate;
+@property(weak, nonatomic, readonly) id<FullScreenControllerDelegate> delegate;
 // Current height of the header, in points. This is a pass-through method that
 // fetches the header height from the FullScreenControllerDelegate.
 @property(nonatomic, readonly) CGFloat headerHeight;
 // |top| field of UIScrollView.contentInset value caused by header.
 // Always 0 for WKWebView, as it does not support contentInset.
 @property(nonatomic, readonly) CGFloat topContentInsetCausedByHeader;
 // Last known y offset of the content in the scroll view during a scroll. Used
 // to infer the direction of the current scroll.
 @property(nonatomic, assign) CGFloat previousContentOffset;
 // Last known y offset requested on the scroll view. In general the same value
@@ skipping 712 matching lines @@
   overscrollActionsInProgress_ = NO;
 }
 
 #pragma mark - Used for testing
 
 + (void)setEnabledForTests:(BOOL)enabled {
   gEnabledForTests = enabled;
 }
 
 @end