MacViews: Partially implement OSExchangeDataProviderMac.

ui/base/clipboard/clipboard.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 UI_BASE_CLIPBOARD_CLIPBOARD_H_
 #define UI_BASE_CLIPBOARD_CLIPBOARD_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 73 matching lines @@
 #if defined(USE_AURA)
     // FormatType can be used in a set on some platforms.
     bool operator<(const FormatType& other) const;
 #endif
 
 #if defined(OS_WIN)
     const FORMATETC& ToFormatEtc() const { return data_; }
 #elif defined(USE_AURA)
     const std::string& ToString() const { return data_; }
 #elif defined(OS_MACOSX)
+    NSString* ToNSString() const { return data_; }
     // Custom copy and assignment constructor to handle NSString.
     FormatType(const FormatType& other);
     FormatType& operator=(const FormatType& other);
 #endif
 
     bool Equals(const FormatType& other) const;
 
    private:
     friend class Clipboard;
 
     // Platform-specific glue used internally by the Clipboard class. Each
     // plaform should define,at least one of each of the following:
     // 1. A constructor that wraps that native clipboard format descriptor.
     // 2. An accessor to retrieve the wrapped descriptor.
     // 3. A data member to hold the wrapped descriptor.
     //
     // Note that in some cases, the accessor for the wrapped descriptor may be
     // public, as these format types can be used by drag and drop code as well.
 #if defined(OS_WIN)
     explicit FormatType(UINT native_format);
     FormatType(UINT native_format, LONG index);
     UINT ToUINT() const { return data_.cfFormat; }
     FORMATETC data_;
 #elif defined(USE_AURA)
     explicit FormatType(const std::string& native_format);
     const std::string& data() const { return data_; }
     std::string data_;
 #elif defined(OS_MACOSX)
     explicit FormatType(NSString* native_format);
-    NSString* ToNSString() const { return data_; }
     NSString* data_;
 #elif defined(OS_ANDROID)
     explicit FormatType(const std::string& native_format);
     const std::string& data() const { return data_; }
     std::string data_;
 #else
 #error No FormatType definition.
 #endif
 
     // Copyable and assignable, since this is essentially an opaque value type.
@@ skipping 231 matching lines @@
   class AuraX11Details;
   scoped_ptr<AuraX11Details> aurax11_details_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Clipboard);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_CLIPBOARD_CLIPBOARD_H_