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

ios/chrome/browser/ui/omnibox/omnibox_text_field_ios.h

 // Copyright (c) 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_OMNIBOX_OMNIBOX_TEXT_FIELD_IOS_H_
 #define IOS_CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_TEXT_FIELD_IOS_H_
 
 #import <UIKit/UIKit.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 124 matching lines @@
 
 // Fade in/out the text and auxillary views depending on |style|.
 - (void)animateFadeWithStyle:(OmniboxTextFieldFadeStyle)style;
 // Reverses animations added by |-animateFadeWithStyle:|.
 - (void)reverseFadeAnimations;
 // Called when animations added by |-animateFadeWithStyle:| can be removed.
 - (void)cleanUpFadeAnimations;
 
 // Redeclare the delegate property to be the more specific
 // OmniboxTextFieldDelegate.
-@property(nonatomic, assign) id<OmniboxTextFieldDelegate> delegate;
+@property(nonatomic, weak) id<OmniboxTextFieldDelegate> delegate;
 
-@property(nonatomic, retain) NSString* preEditText;
+@property(nonatomic, strong) NSString* preEditText;
 @property(nonatomic) BOOL clearingPreEditText;
-@property(nonatomic, retain) UIColor* selectedTextBackgroundColor;
-@property(nonatomic, retain) UIColor* placeholderTextColor;
+@property(nonatomic, strong) UIColor* selectedTextBackgroundColor;
+@property(nonatomic, strong) UIColor* placeholderTextColor;
 @property(nonatomic, assign) BOOL incognito;
 
 @end
 
 // A category for defining new methods that access private ivars.
 @interface OmniboxTextFieldIOS (TestingUtilities)
 - (UILabel*)preEditStaticLabel;
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_TEXT_FIELD_IOS_H_