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

ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.h

 // Copyright 2015 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_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/chrome/browser/ui/overscroll_actions/overscroll_actions_view.h"
@@ skipping 68 matching lines @@
 // Init the OverscrollActionsController with a nil scrollview.
 // If the scrollview is nil then the OverscrollActionsController will be
 // configured to use the scrollview from the CRWWebControllerObserver.
 - (instancetype)init;
 // Designated initializer, when initialized with a scrollview, the
 // OverscrollActionsController will not use the CRWWebControllerObserver to
 // configure the scrollview, it will directly use the passed scrollview.
 - (instancetype)initWithScrollView:(UIScrollView*)scrollView;
 
 // The scrollview the overscroll controller will control.
-@property(nonatomic, readonly) UIScrollView* scrollView;
+@property(weak, nonatomic, readonly) UIScrollView* scrollView;
 // The current state of the overscroll controller.
 @property(nonatomic, assign, readonly) OverscrollState overscrollState;
 // The delegate must be set for the OverscrollActionsController to work
 // properly.
-@property(nonatomic, assign) id<OverscrollActionsControllerDelegate> delegate;
+@property(nonatomic, weak) id<OverscrollActionsControllerDelegate> delegate;
 
 // Used to clear state maintained by the controller and de-register from
 // notifications. After this call the controller ceases to function and will
 // clear its delegate.
 - (void)invalidate;
 // Schedules call to |invalidate| at the end of the current action. This lets
 // the animation finish before invalidating the controller.
 // If no action is running, calls |invalidate| immediately.
 - (void)scheduleInvalidate;
 // Force the controller to switch to NO_PULL_STARTED state.
 - (void)clear;
 // Disabling overscroll actions will stop showing the overscroll actions view on
 // top of the header when the user is pulling the webview's scrollview.
 // Disable/enableOverscrollActions method calls are ref counted, this means
 // that calls to disable must be compensated by the same amount of call to
 // enable in order to reenable overscroll actions.
 - (void)disableOverscrollActions;
 // Enabling overscroll actions will reverse the effect of a call to
 // -disableOverscrollActions.
 - (void)enableOverscrollActions;
 // Sets the style of the overscroll actions.
 - (void)setStyle:(OverscrollStyle)style;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_OVERSCROLL_ACTIONS_OVERSCROLL_ACTIONS_CONTROLLER_H_