mac: Fix os_exchange_data_provider_mac.mm.

ui/base/dragdrop/os_exchange_data_provider_mac.mm

 // Copyright 2014 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.
 
 #include "ui/base/dragdrop/os_exchange_data_provider_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
 #include "base/pickle.h"
 #include "base/strings/sys_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 #include "url/gurl.h"
 
 namespace ui {
 
 OSExchangeDataProviderMac::OSExchangeDataProviderMac()
     : pasteboard_([[NSPasteboard pasteboardWithUniqueName] retain]) {
 }
 
 OSExchangeDataProviderMac::OSExchangeDataProviderMac(NSPasteboard* pasteboard)
@@ skipping 43 matching lines @@
     const OSExchangeData::CustomFormat& format,
     const base::Pickle& data) {
   NSData* ns_data = [NSData dataWithBytes:data.data() length:data.size()];
   [pasteboard_ setData:ns_data forType:format.ToNSString()];
 }
 
 bool OSExchangeDataProviderMac::GetString(base::string16* data) const {
   DCHECK(data);
   NSArray* items = [pasteboard_ readObjectsForClasses:@[ [NSString class] ]
                                               options:@{ }];
-  if ([items count] == 0)
-    return false;
+
+  // There was no NSString, check for an NSURL.
+  if ([items count] == 0) {
+    GURL url;
+    base::string16 title;
+    bool result =
+        GetURLAndTitle(OSExchangeData::DO_NOT_CONVERT_FILENAMES, &url, &title);
+    if (result)
+      *data = base::UTF8ToUTF16(url.spec());
+    return result;
+  }
 
   *data = base::SysNSStringToUTF16([items objectAtIndex:0]);
   return true;
 }
 
 bool OSExchangeDataProviderMac::GetURLAndTitle(
     OSExchangeData::FilenameToURLPolicy policy,
     GURL* url,
     base::string16* title) const {
   DCHECK(url);
@@ skipping 73 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // OSExchangeData, public:
 
 // static
 OSExchangeData::Provider* OSExchangeData::CreateProvider() {
   return new OSExchangeDataProviderMac;
 }
 
 }  // namespace ui