Adds Clipboard::Format::data() member to match android

This gets more to compile.

R=ben@chromium.org
BUG=none
TEST=none

Review URL: https://codereview.chromium.org/128343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243622 0039d316-1c4b-4281-b951-d872f2087c98

ui/base/clipboard/clipboard.h

@@ -118,6 +118,7 @@ class UI_BASE_EXPORT Clipboard : NON_EXPORTED_BASE(public base::ThreadChecker) {
     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);