Remove implicit conversions from scoped_refptr to T* in ui/

ui/snapshot/snapshot_async.cc

Index: ui/snapshot/snapshot_async.cc
diff --git a/ui/snapshot/snapshot_async.cc b/ui/snapshot/snapshot_async.cc
index 5f18225fcf431dc7a463525f58ed001f577002d2..cbb58cc085b6a7a9b72ee2bec3268d3d72000f38 100644
--- a/ui/snapshot/snapshot_async.cc
+++ b/ui/snapshot/snapshot_async.cc
@@ -74,7 +74,7 @@ void SnapshotAsync::ScaleCopyOutputResult(
   // be used here because it's not in content/public. Move the scaling code
   // somewhere so that it can be reused here.
   base::PostTaskAndReplyWithResult(
-      background_task_runner,
+      background_task_runner.get(),
       FROM_HERE,
       base::Bind(ScaleBitmap, *result->TakeBitmap(), target_size),
       base::Bind(&OnFrameScalingFinished, callback));
@@ -94,7 +94,7 @@ void SnapshotAsync::EncodeCopyOutputResult(
   // be used here because it's not in content/public. Move the scaling code
   // somewhere so that it can be reused here.
   base::PostTaskAndReplyWithResult(
-      background_task_runner,
+      background_task_runner.get(),
       FROM_HERE,
       base::Bind(EncodeBitmap, *result->TakeBitmap()),
       callback);