Clean up ifdef around FilePath creation in /src/third_party

third_party/leveldatabase/env_chromium.cc

Index: third_party/leveldatabase/env_chromium.cc
diff --git a/third_party/leveldatabase/env_chromium.cc b/third_party/leveldatabase/env_chromium.cc
index 76f081f0c65b56fc379f29136c530958a55be83f..b34cecd37023e56271966a8bc2b13290d2719582 100644
--- a/third_party/leveldatabase/env_chromium.cc
+++ b/third_party/leveldatabase/env_chromium.cc
@@ -338,11 +338,7 @@ std::string FilePathToString(const base::FilePath& file_path) {
 }
 
 base::FilePath ChromiumEnv::CreateFilePath(const std::string& file_path) {
-#if defined(OS_WIN)
-  return base::FilePath(base::UTF8ToUTF16(file_path));
-#else
-  return base::FilePath(file_path);
-#endif
+  return base::FilePath::FromUTF8Unsafe(file_path);
 }
 
 bool ChromiumEnv::MakeBackup(const std::string& fname) {