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

chrome/test/chromedriver/capabilities_unittest.cc

 // Copyright (c) 2013 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/chromedriver/capabilities.h"
 
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome/status.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(ParseCapabilities, WithAndroidPackage) {
   Capabilities capabilities;
   base::DictionaryValue caps;
   caps.SetString("chromeOptions.android_package", "abc");
   Status status = capabilities.Parse(caps);
   ASSERT_TRUE(status.IsOk());
   ASSERT_TRUE(capabilities.IsAndroid());
   ASSERT_EQ("abc", capabilities.android_package);
 }
 
 TEST(ParseCapabilities, EmptyAndroidPackage) {
   Capabilities capabilities;
   base::DictionaryValue caps;
-  caps.SetString("chromeOptions.android_package", "");
+  caps.SetString("chromeOptions.android_package", std::string());
   Status status = capabilities.Parse(caps);
   ASSERT_FALSE(status.IsOk());
 }
 
 TEST(ParseCapabilities, IllegalAndroidPackage) {
   Capabilities capabilities;
   base::DictionaryValue caps;
   caps.SetInteger("chromeOptions.android_package", 123);
   Status status = capabilities.Parse(caps);
   ASSERT_FALSE(status.IsOk());
@@ skipping 210 matching lines @@
 
 TEST(ParseCapabilities, MissingSettingForManualProxy) {
   Capabilities capabilities;
   base::DictionaryValue proxy;
   proxy.SetString("proxyType", "manual");
   base::DictionaryValue caps;
   caps.Set("proxy", proxy.DeepCopy());
   Status status = capabilities.Parse(caps);
   ASSERT_FALSE(status.IsOk());
 }