Make common utility to load views from nibs.

ui/base/cocoa/nib_loading.h

Index: ui/base/cocoa/nib_loading.h
diff --git a/ui/base/cocoa/nib_loading.h b/ui/base/cocoa/nib_loading.h
new file mode 100644
index 0000000000000000000000000000000000000000..653aba419f85d9068f633b24997afa56a7521efb
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+++ b/ui/base/cocoa/nib_loading.h
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+// 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 UI_BASE_COCOA_NIB_LOADING_H_
+#define UI_BASE_COCOA_NIB_LOADING_H_
+#pragma once
+
+#import <Cocoa/Cocoa.h>
+
+#include "ui/base/ui_export.h"
+
+namespace ui {
+
+// Given the name of a nib file, gets an unowned reference to the NSView in the
+// nib. Requires a nib with just a single root view.
+UI_EXPORT NSView* GetViewFromNib(NSString* name);
+
+}  // namespace ui
+
+#endif  // UI_BASE_COCOA_NIB_LOADING_H_