Move HyperlinkButtonCell to /ui/base/cocoa/controls.

ui/base/cocoa/controls/hyperlink_button_cell.h

 // Copyright (c) 2011 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 UI_BASE_COCOA_CONTROLS_HYPERLINK_BUTTON_CELL_H_
+#define UI_BASE_COCOA_CONTROLS_HYPERLINK_BUTTON_CELL_H_
+
 #import <Cocoa/Cocoa.h>
+
 #include "base/mac/scoped_nsobject.h"
+#include "ui/base/ui_export.h"
 
 // A HyperlinkButtonCell is used to create an NSButton that looks and acts
 // like a hyperlink. The default styling is to look like blue, underlined text
 // and to have the pointingHand cursor on mouse over.
 //
 // To use in Interface Builder:
 //  1. Drag out an NSButton.
 //  2. Double click on the button so you have the cell component selected.
 //  3. In the Identity panel of the inspector, set the custom class to this.
 //  4. In the Attributes panel, change the Bezel to Square.
 //  5. In the Size panel, set the Height to 16.

[Nico, 2013/07/03 19:31:07]

Maybe this should have a sentence "Use this if all of your text is a link. If
you need text that contains embedded links but also regular text, use
HyperlinkTextView"?

[tapted, 2013/07/03 23:30:05]

Done.

(Another difference: HyperlinkTextView doesn't currently play nice with focus
rings / keyboard accessibility. But that's maybe implied from other properties,
so not worth mentioning).

+UI_EXPORT
 @interface HyperlinkButtonCell : NSButtonCell {
   base::scoped_nsobject<NSColor> textColor_;
   BOOL shouldUnderline_;
   BOOL underlineOnHover_;
   BOOL mouseIsInside_;
 }
 @property(nonatomic, retain) NSColor* textColor;
 @property(nonatomic, assign) BOOL underlineOnHover;
 @property(nonatomic, assign) BOOL shouldUnderline;
 
 + (NSColor*)defaultTextColor;
 
 // Helper function to create a button with HyperLinkButtonCell as its cell.
 + (NSButton*)buttonWithString:(NSString*)string;
 
 @end
 
 @interface HyperlinkButtonCell (ExposedForTesting)
 - (NSDictionary*)linkAttributes;
 @end
+
+#endif  // UI_BASE_COCOA_CONTROLS_HYPERLINK_BUTTON_CELL_H_