Rewrite std::string("") to std::string(), Linux edition.

ppapi/tests/test_flash_clipboard.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 "ppapi/tests/test_flash_clipboard.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ppapi/cpp/instance.h"
@@ skipping 235 matching lines @@
   ASSERT_TRUE(IsFormatAvailableMatches(invalid_format, false));
   std::string unused;
   ASSERT_FALSE(ReadStringVar(invalid_format, &unused));
 
   PASS();
 }
 
 std::string TestFlashClipboard::TestRegisterCustomFormat() {
   // Test an empty name is rejected.
   uint32_t format_id =
-      pp::flash::Clipboard::RegisterCustomFormat(instance_, "");
+      pp::flash::Clipboard::RegisterCustomFormat(instance_, std::string());
   ASSERT_EQ(format_id, PP_FLASH_CLIPBOARD_FORMAT_INVALID);
 
   // Test a valid format name.
   format_id = pp::flash::Clipboard::RegisterCustomFormat(instance_, "a-b");
   ASSERT_NE(format_id, PP_FLASH_CLIPBOARD_FORMAT_INVALID);
   // Make sure the format doesn't collide with predefined formats.
   ASSERT_NE(format_id, PP_FLASH_CLIPBOARD_FORMAT_PLAINTEXT);
   ASSERT_NE(format_id, PP_FLASH_CLIPBOARD_FORMAT_HTML);
   ASSERT_NE(format_id, PP_FLASH_CLIPBOARD_FORMAT_RTF);
 
   // Check that if the same name is registered, the same id comes out.
   uint32_t format_id2 =
       pp::flash::Clipboard::RegisterCustomFormat(instance_, "a-b");
   ASSERT_EQ(format_id, format_id2);
 
   // Check that the second format registered has a different id.
   uint32_t format_id3 =
       pp::flash::Clipboard::RegisterCustomFormat(instance_, "a-b-c");
   ASSERT_NE(format_id, format_id3);
 
   PASS();
 }