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

chrome/browser/search/search_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 "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/browser_with_test_window_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
 
 namespace chrome {
 
 TEST(EmbeddedSearchFieldTrialTest, GetFieldTrialInfo) {
   FieldTrialFlags flags;
   uint64 group_number = 0;
   const uint64 ZERO = 0;
 
-  EXPECT_FALSE(GetFieldTrialInfo("", &flags, &group_number));
+  EXPECT_FALSE(GetFieldTrialInfo(std::string(), &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 
   EXPECT_TRUE(GetFieldTrialInfo("Group77", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(ZERO, flags.size());
 
   group_number = 0;
   EXPECT_FALSE(GetFieldTrialInfo("Group77.2", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
@@ skipping 19 matching lines @@
   EXPECT_EQ(uint64(6), GetUInt64ValueForFlagWithDefault("foo", 9999, flags));
 
   group_number = 0;
   flags.clear();
   EXPECT_TRUE(GetFieldTrialInfo(
       "Group77 bar:1 baz:7 cat:dogs", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(uint64(3), flags.size());
   EXPECT_EQ(true, GetBoolValueForFlagWithDefault("bar", false, flags));
   EXPECT_EQ(uint64(7), GetUInt64ValueForFlagWithDefault("baz", 0, flags));
-  EXPECT_EQ("dogs", GetStringValueForFlagWithDefault("cat", "", flags));
-  EXPECT_EQ("default", GetStringValueForFlagWithDefault(
-      "moose", "default", flags));
+  EXPECT_EQ("dogs",
+            GetStringValueForFlagWithDefault("cat", std::string(), flags));
+  EXPECT_EQ("default",
+            GetStringValueForFlagWithDefault("moose", "default", flags));
 
   group_number = 0;
   flags.clear();
   EXPECT_FALSE(GetFieldTrialInfo(
       "Group77 bar:1 baz:7 cat:dogs DISABLED", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 }
 
 class SearchTest : public BrowserWithTestWindowTest {
@@ skipping 245 matching lines @@
   profile()->GetPrefs()->SetBoolean(prefs::kInstantEnabled, true);
   EXPECT_EQ(GURL("http://foo.com/instant?foo=foo#foo=foo"),
             GetInstantURL(profile(), kDisableStartMargin));
 
   // With start margin.
   EXPECT_EQ(GURL("http://foo.com/instant?es_sm=10&foo=foo#foo=foo"),
             GetInstantURL(profile(), 10));
 }
 
 }  // namespace chrome