Move directory creation functions to base namespace.

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 265a42ed5ac9efaae8b2e8e6a9dceb8bed36019d..00f8583abaf1dc2d21dd0a0dc91e9d5709109599 100644
--- a/third_party/leveldatabase/env_chromium.cc
+++ b/third_party/leveldatabase/env_chromium.cc
@@ -838,7 +838,7 @@ Status ChromiumEnv::CreateDir(const std::string& name) {
   base::PlatformFileError error = base::PLATFORM_FILE_OK;
   Retrier retrier(kCreateDir, this);
   do {
-    if (::file_util::CreateDirectoryAndGetError(CreateFilePath(name), &error))
+    if (base::CreateDirectoryAndGetError(CreateFilePath(name), &error))
       return result;
   } while (retrier.ShouldKeepTrying(error));
   result = MakeIOError(name, "Could not create directory.", kCreateDir, error);