ash: Clean up naming of paint-related identifiers

ash/common/system/user/rounded_image_view.cc

Index: ash/common/system/user/rounded_image_view.cc
diff --git a/ash/common/system/user/rounded_image_view.cc b/ash/common/system/user/rounded_image_view.cc
index d90df62703f1150bea989a84d8f087f44f9abfce..d7717b857464714fb7897641ecdafcaa52d93f8f 100644
--- a/ash/common/system/user/rounded_image_view.cc
+++ b/ash/common/system/user/rounded_image_view.cc
@@ -63,14 +63,14 @@ void RoundedImageView::OnPaint(gfx::Canvas* canvas) {
       SkIntToScalar(corner_radius_[3]), SkIntToScalar(corner_radius_[3])};
   SkPath path;
   path.addRoundRect(gfx::RectToSkRect(image_bounds), kRadius);
-  cc::PaintFlags paint;
-  paint.setAntiAlias(true);
+  cc::PaintFlags flags;
+  flags.setAntiAlias(true);
   const bool grayscale =
       !active_user_ && !MaterialDesignController::IsSystemTrayMenuMaterial();
-  paint.setBlendMode(grayscale ? SkBlendMode::kLuminosity
+  flags.setBlendMode(grayscale ? SkBlendMode::kLuminosity
                                : SkBlendMode::kSrcOver);
   canvas->DrawImageInPath(resized_, image_bounds.x(), image_bounds.y(), path,
-                          paint);
+                          flags);
 }
 
 }  // namespace tray