mojo: Add DataURLFetcher for processing data: urls.

mojo/package_manager/package_manager_impl.cc

Index: mojo/package_manager/package_manager_impl.cc
diff --git a/mojo/package_manager/package_manager_impl.cc b/mojo/package_manager/package_manager_impl.cc
index f1a1fc6bfb7be73f21c404c02923cc44b3d572c4..a2af6c1338fec487efa3d3f13858cd97a13b056a 100644
--- a/mojo/package_manager/package_manager_impl.cc
+++ b/mojo/package_manager/package_manager_impl.cc
@@ -5,6 +5,7 @@
 #include "mojo/package_manager/package_manager_impl.h"
 
 #include "mojo/fetcher/about_fetcher.h"
+#include "mojo/fetcher/data_fetcher.h"
 #include "mojo/fetcher/local_fetcher.h"
 #include "mojo/fetcher/network_fetcher.h"
 #include "mojo/fetcher/switches.h"
@@ -67,6 +68,11 @@ void PackageManagerImpl::FetchRequest(
     return;
   }
 
+  if (url.SchemeIs(url::kDataScheme)) {
+    fetcher::DataFetcher::Start(url, loader_callback);
+    return;
+  }
+
   GURL resolved_url = ResolveURL(url);
 
   if (resolved_url.SchemeIsFile()) {