Cleanup: Remove some unneeded string allocations.

ui/base/clipboard/clipboard_aurax11.cc

 // 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.
 
 #include "ui/base/clipboard/clipboard_aurax11.h"
 
 #include <X11/extensions/Xfixes.h>
 #include <X11/Xatom.h>
 #include <list>
 #include <set>
@@ skipping 872 matching lines @@
 void ClipboardAuraX11::WriteRTF(const char* rtf_data, size_t data_len) {
   WriteData(GetRtfFormatType(), rtf_data, data_len);
 }
 
 void ClipboardAuraX11::WriteBookmark(const char* title_data,
                                      size_t title_len,
                                      const char* url_data,
                                      size_t url_len) {
   // Write as a mozilla url (UTF16: URL, newline, title).
   base::string16 url = base::UTF8ToUTF16(std::string(url_data, url_len) + "\n");
-  base::string16 title = base::UTF8ToUTF16(std::string(title_data, title_len));
+  base::string16 title =
+      base::UTF8ToUTF16(base::StringPiece(title_data, title_len));
 
   std::vector<unsigned char> data;
   ui::AddString16ToVector(url, &data);
   ui::AddString16ToVector(title, &data);
   scoped_refptr<base::RefCountedMemory> mem(
       base::RefCountedBytes::TakeVector(&data));
 
   aurax11_details_->InsertMapping(kMimeTypeMozillaURL, mem);
 }
 
@@ skipping 25 matching lines @@
   if (format.Equals(GetBitmapFormatType()))
     return;
 
   std::vector<unsigned char> bytes(data_data, data_data + data_len);
   scoped_refptr<base::RefCountedMemory> mem(
       base::RefCountedBytes::TakeVector(&bytes));
   aurax11_details_->InsertMapping(format.ToString(), mem);
 }
 
 }  // namespace ui