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

webkit/fileapi/obfuscated_file_util_unittest.cc

Index: webkit/fileapi/obfuscated_file_util_unittest.cc
diff --git a/webkit/fileapi/obfuscated_file_util_unittest.cc b/webkit/fileapi/obfuscated_file_util_unittest.cc
index 387f28e0f5be9296f52874c090f9da597c353543..6a6d4a6432e57834c6cf88302066224c1a7fc64c 100644
--- a/webkit/fileapi/obfuscated_file_util_unittest.cc
+++ b/webkit/fileapi/obfuscated_file_util_unittest.cc
@@ -941,7 +941,7 @@ TEST_F(ObfuscatedFileUtilTest, TestDirectoryOps) {
   EXPECT_EQ(base::PLATFORM_FILE_ERROR_NOT_FOUND,
       ofu()->DeleteDirectory(context.get(), url));
 
-  FileSystemURL root = CreateURLFromUTF8("");
+  FileSystemURL root = CreateURLFromUTF8(std::string());
   EXPECT_FALSE(DirectoryExists(url));
   EXPECT_FALSE(PathExists(url));
   context.reset(NewContext(NULL));
@@ -1081,7 +1081,7 @@ TEST_F(ObfuscatedFileUtilTest, TestReadDirectory) {
 }
 
 TEST_F(ObfuscatedFileUtilTest, TestReadRootWithSlash) {
-  TestReadDirectoryHelper(CreateURLFromUTF8(""));
+  TestReadDirectoryHelper(CreateURLFromUTF8(std::string()));
 }
 
 TEST_F(ObfuscatedFileUtilTest, TestReadRootWithEmptyString) {