fix clang-tidy warnings

unused declaration
passing std::move() to const&

These are triggering warnings in google3

Change-Id: I12cebd0a8fd218e7755718fed7acec7908d386a1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/271138
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index 29def71..3570f21 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -79,7 +79,6 @@
 DECLARE_int(gpuThreads);
 
 using sk_gpu_test::GrContextFactory;
-using sk_gpu_test::ContextInfo;
 
 namespace DM {
 
diff --git a/tools/DDLTileHelper.cpp b/tools/DDLTileHelper.cpp
index ad9fe04..1e5e868 100644
--- a/tools/DDLTileHelper.cpp
+++ b/tools/DDLTileHelper.cpp
@@ -102,7 +102,7 @@
     SkCanvas* canvas = fDstSurface->getCanvas();
     canvas->save();
     canvas->clipRect(SkRect::Make(fClip));
-    canvas->drawImage(std::move(fImage), fClip.fLeft, fClip.fTop);
+    canvas->drawImage(fImage, fClip.fLeft, fClip.fTop);
     canvas->restore();
 }