cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 152288677ab76590f8b631d3e6e6c065a97e9661..0e7c938f224f8d9f5dd2ff20f3b7899b4c8b29da 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -1102,9 +1102,9 @@ void ResourceProvider::CleanUpGLIfNeeded() {
   }
 #endif  // DCHECK_IS_ON
 
-  texture_uploader_.reset();
-  texture_id_allocator_.reset();
-  buffer_id_allocator_.reset();
+  texture_uploader_ = nullptr;
+  texture_id_allocator_ = nullptr;
+  buffer_id_allocator_ = nullptr;
   gl->Finish();
 }