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

chrome/browser/extensions/api/downloads/downloads_api_unittest.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 <algorithm>
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_reader.h"
 #include "base/message_loop.h"
@@ skipping 719 matching lines @@
       fs_(BrowserContext::GetDefaultStoragePartition(profile_)->
           GetFileSystemContext()) {
     CHECK(profile_);
     CHECK(events_listener_);
     CHECK(fs_);
   }
 
   ~HTML5FileWriter() {
     CHECK(BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, base::Bind(
         &HTML5FileWriter::TearDownURLRequestContext, base::Unretained(this))));
-    events_listener_->WaitFor(profile_, kURLRequestContextToreDown, "");
+    events_listener_->WaitFor(
+        profile_, kURLRequestContextToreDown, std::string());
   }
 
   bool WriteFile() {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     fs_->OpenFileSystem(
         GURL(origin_),
         fileapi::kFileSystemTypeTemporary,
         kCreateFileSystem,
         base::Bind(&HTML5FileWriter::OpenFileSystemCallback,
                    base::Unretained(this)));
@@ skipping 313 matching lines @@
   // Let cleanup complete on the FILE thread.
   content::RunAllPendingInMessageLoop(BrowserThread::FILE);
   // Check the path passed to the icon extractor post-cancellation.
   EXPECT_TRUE(RunFunctionAndReturnString(MockedGetFileIconFunction(
           download_item->GetTargetFilePath(), IconLoader::NORMAL, "foo"),
       args32,
       &result_string));
 
   // Simulate an error during icon load by invoking the mock with an empty
   // result string.
-  std::string error = RunFunctionAndReturnError(MockedGetFileIconFunction(
-        download_item->GetTargetFilePath(), IconLoader::NORMAL, ""),
+  std::string error = RunFunctionAndReturnError(
+      MockedGetFileIconFunction(download_item->GetTargetFilePath(),
+                                IconLoader::NORMAL,
+                                std::string()),
       args32);
   EXPECT_STREQ(download_extension_errors::kIconNotFoundError, error.c_str());
 
   // Once the download item is deleted, we should return kInvalidOperationError.
   int id = download_item->GetId();
   download_item->Delete(DownloadItem::DELETE_DUE_TO_USER_DISCARD);
   download_item = NULL;
   EXPECT_EQ(static_cast<DownloadItem*>(NULL),
             GetCurrentManager()->GetDownload(id));
   error = RunFunctionAndReturnError(new DownloadsGetFileIconFunction(), args32);
@@ skipping 2161 matching lines @@
                          "  \"state\": {"
                          "    \"previous\": \"in_progress\","
                          "    \"current\": \"complete\"}}]",
                          item->GetId(),
                          GetFilename("42.txt.crdownload").c_str(),
                          GetFilename("42.txt").c_str())));
 }
 
 // TODO(benjhayden) Figure out why DisableExtension() does not fire
 // OnListenerRemoved.