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

chrome/common/extensions/manifest_tests/extension_manifest_test.cc

Index: chrome/common/extensions/manifest_tests/extension_manifest_test.cc
diff --git a/chrome/common/extensions/manifest_tests/extension_manifest_test.cc b/chrome/common/extensions/manifest_tests/extension_manifest_test.cc
index b61d5f79e3e3dab99d844f7765455652c1c6f3b4..4e72588c94f175cfa4f334488ee57952541f5714 100644
--- a/chrome/common/extensions/manifest_tests/extension_manifest_test.cc
+++ b/chrome/common/extensions/manifest_tests/extension_manifest_test.cc
@@ -217,20 +217,16 @@ ExtensionManifestTest::Testcase::Testcase(std::string manifest_filename,
 
 ExtensionManifestTest::Testcase::Testcase(std::string manifest_filename)
     : manifest_filename_(manifest_filename),
-      expected_error_(""),
       location_(extensions::Manifest::INTERNAL),
-      flags_(Extension::NO_FLAGS) {
-}
+      flags_(Extension::NO_FLAGS) {}
 
 ExtensionManifestTest::Testcase::Testcase(
     std::string manifest_filename,
     extensions::Manifest::Location location,
     int flags)
     : manifest_filename_(manifest_filename),
-      expected_error_(""),
       location_(location),
-      flags_(flags) {
-}
+      flags_(flags) {}
 
 void ExtensionManifestTest::RunTestcases(const Testcase* testcases,
                                          size_t num_testcases,