Remove unused code from WebMimeRegistry.

content/browser/mime_registry_message_filter.cc

Index: content/browser/mime_registry_message_filter.cc
diff --git a/content/browser/mime_registry_message_filter.cc b/content/browser/mime_registry_message_filter.cc
index 0a823af2a9ff984e51af9a7bbb5fc386bf523bea..1b6987e78767475dabd66acb79c47f3d35c7704c 100644
--- a/content/browser/mime_registry_message_filter.cc
+++ b/content/browser/mime_registry_message_filter.cc
@@ -28,8 +28,6 @@ bool MimeRegistryMessageFilter::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(MimeRegistryMessageFilter, message)
     IPC_MESSAGE_HANDLER(MimeRegistryMsg_GetMimeTypeFromExtension,
                         OnGetMimeTypeFromExtension)
-    IPC_MESSAGE_HANDLER(MimeRegistryMsg_GetMimeTypeFromFile,
-                        OnGetMimeTypeFromFile)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -40,9 +38,4 @@ void MimeRegistryMessageFilter::OnGetMimeTypeFromExtension(
   net::GetMimeTypeFromExtension(ext, mime_type);
 }
 
-void MimeRegistryMessageFilter::OnGetMimeTypeFromFile(
-    const base::FilePath& file_path, std::string* mime_type) {
-  net::GetMimeTypeFromFile(file_path, mime_type);
-}
-
 }  // namespace content