Fix cases of variable shadowing in /src/.

If we manage to fix all the existing cases of variable shadowing, we
could enable -Wshadow.

Change-Id: Ibebddec324c1b6615c8ec3d118e55d1e59757fbe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/439398
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/utils/SkShadowUtils.cpp b/src/utils/SkShadowUtils.cpp
index f433821..38c3729 100644
--- a/src/utils/SkShadowUtils.cpp
+++ b/src/utils/SkShadowUtils.cpp
@@ -839,7 +839,7 @@
                                                                  &shadowMatrix, &radius)) {
                     return;
                 }
-                SkAutoDeviceTransformRestore adr(this, shadowMatrix);
+                SkAutoDeviceTransformRestore adr2(this, shadowMatrix);
 
                 SkPaint paint;
                 paint.setColor(rec.fSpotColor);