Adds GetDisplays() to WindowManager

components/resource_provider/resource_provider_apptest.cc

Index: components/resource_provider/resource_provider_apptest.cc
diff --git a/components/resource_provider/resource_provider_apptest.cc b/components/resource_provider/resource_provider_apptest.cc
index 5484368bd79da9bf8b4881631f89c96c98553fe8..c1f0d07f954f6e76cb2de2839deb0d1304e57d00 100644
--- a/components/resource_provider/resource_provider_apptest.cc
+++ b/components/resource_provider/resource_provider_apptest.cc
@@ -56,7 +56,7 @@ class ResourceProviderApplicationTest : public mojo::test::ApplicationTestBase {
   // resources are returned. The return map maps from the path to the contents
   // of the file at the specified path.
   ResourceContentsMap GetResources(const std::set<std::string>& paths) {
-    ResourceLoader loader(application_impl()->shell(), paths);
+    ResourceLoader loader(application_impl(), paths);
     loader.BlockUntilLoaded();
 
     // Load the contents of each of the handles.