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

chrome/common/extensions/update_manifest_unittest.cc

 // Copyright (c) 2011 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/memory/scoped_vector.h"
 #include "chrome/common/extensions/update_manifest.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "libxml/globals.h"
 
 static const char* kValidXml =
@@ skipping 102 matching lines @@
 " </app>"
 " <app appid='bbbbbbbb'>"
 "  <updatecheck codebase='http://example.com/b_3.1.crx' version='3.1'/>"
 " </app>"
 "</gupdate>";
 
 TEST(ExtensionUpdateManifestTest, TestUpdateManifest) {
   UpdateManifest parser;
 
   // Test parsing of a number of invalid xml cases
-  EXPECT_FALSE(parser.Parse(""));
+  EXPECT_FALSE(parser.Parse(std::string()));
   EXPECT_FALSE(parser.errors().empty());
 
   EXPECT_TRUE(parser.Parse(kMissingAppId));
   EXPECT_TRUE(parser.results().list.empty());
   EXPECT_FALSE(parser.errors().empty());
 
   EXPECT_TRUE(parser.Parse(kInvalidCodebase));
   EXPECT_TRUE(parser.results().list.empty());
   EXPECT_FALSE(parser.errors().empty());
 
@@ skipping 44 matching lines @@
   EXPECT_EQ(firstResult->extension_id, "12345");
   EXPECT_EQ(firstResult->version, "");
 
   // Parse xml with one error and one success <app> tag.
   EXPECT_TRUE(parser.Parse(kTwoAppsOneError));
   EXPECT_FALSE(parser.errors().empty());
   EXPECT_EQ(1u, parser.results().list.size());
   firstResult = &parser.results().list.at(0);
   EXPECT_EQ(firstResult->extension_id, "bbbbbbbb");
 }