Add explicit base to FilePath.

content/worker/worker_webkitplatformsupport_impl.cc

Index: content/worker/worker_webkitplatformsupport_impl.cc
diff --git a/content/worker/worker_webkitplatformsupport_impl.cc b/content/worker/worker_webkitplatformsupport_impl.cc
index d52211bf720ee2f3c02006f3c273104fedf08d26..29fdc62c3e0da29125090367ee73d69da687d9a1 100644
--- a/content/worker/worker_webkitplatformsupport_impl.cc
+++ b/content/worker/worker_webkitplatformsupport_impl.cc
@@ -262,14 +262,14 @@ WebString WorkerWebKitPlatformSupportImpl::mimeTypeFromFile(
     const WebString& file_path) {
   std::string mime_type;
   SendSyncMessageFromAnyThread(new MimeRegistryMsg_GetMimeTypeFromFile(
-      FilePath(webkit_base::WebStringToFilePathString(file_path)),
+      base::FilePath(webkit_base::WebStringToFilePathString(file_path)),
       &mime_type));
   return ASCIIToUTF16(mime_type);
 }
 
 WebString WorkerWebKitPlatformSupportImpl::preferredExtensionForMIMEType(
     const WebString& mime_type) {
-  FilePath::StringType file_extension;
+  base::FilePath::StringType file_extension;
   SendSyncMessageFromAnyThread(
       new MimeRegistryMsg_GetPreferredExtensionForMimeType(
           UTF16ToASCII(mime_type), &file_extension));