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

chrome/test/ppapi/ppapi_test.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 "chrome/test/ppapi/ppapi_test.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
@@ skipping 138 matching lines @@
   test_path = test_path.Append(FILE_PATH_LITERAL("ppapi"));
   test_path = test_path.Append(FILE_PATH_LITERAL("tests"));
   test_path = test_path.Append(FILE_PATH_LITERAL("test_case.html"));
 
   // Sanity check the file name.
   EXPECT_TRUE(file_util::PathExists(test_path));
 
   GURL test_url = net::FilePathToFileURL(test_path);
 
   GURL::Replacements replacements;
-  std::string query = BuildQuery("", test_case);
+  std::string query = BuildQuery(std::string(), test_case);
   replacements.SetQuery(query.c_str(), url_parse::Component(0, query.size()));
   return test_url.ReplaceComponents(replacements);
 }
 
 void PPAPITestBase::RunTest(const std::string& test_case) {
   GURL url = GetTestFileUrl(test_case);
   RunTestURL(url);
 }
 
 void PPAPITestBase::RunTestAndReload(const std::string& test_case) {
   GURL url = GetTestFileUrl(test_case);
   RunTestURL(url);
   // If that passed, we simply run the test again, which navigates again.
   RunTestURL(url);
 }
 
 void PPAPITestBase::RunTestViaHTTP(const std::string& test_case) {
   base::FilePath document_root;
   ASSERT_TRUE(ui_test_utils::GetRelativeBuildDirectory(&document_root));
   base::FilePath http_document_root;
   ASSERT_TRUE(ui_test_utils::GetRelativeBuildDirectory(&http_document_root));
   net::TestServer http_server(net::TestServer::TYPE_HTTP,
                               net::TestServer::kLocalhost,
                               document_root);
   ASSERT_TRUE(http_server.Start());
-  RunTestURL(GetTestURL(http_server, test_case, ""));
+  RunTestURL(GetTestURL(http_server, test_case, std::string()));
 }
 
 void PPAPITestBase::RunTestWithSSLServer(const std::string& test_case) {
   base::FilePath http_document_root;
   ASSERT_TRUE(ui_test_utils::GetRelativeBuildDirectory(&http_document_root));
   net::TestServer http_server(net::TestServer::TYPE_HTTP,
                               net::TestServer::kLocalhost,
                               http_document_root);
   net::TestServer ssl_server(net::TestServer::TYPE_HTTPS,
                              net::BaseTestServer::SSLOptions(),
@@ skipping 173 matching lines @@
     const std::string& base,
     const std::string& test_case) {
   return base::StringPrintf("%smode=nacl_newlib&testcase=%s", base.c_str(),
                             test_case.c_str());
 }
 
 void PPAPIBrokerInfoBarTest::SetUpOnMainThread() {
   // The default content setting for the PPAPI broker is ASK. We purposefully
   // don't call PPAPITestBase::SetUpOnMainThread() to keep it that way.
 }