ash: Clean up naming of paint-related identifiers

ash/common/wm/panels/panel_layout_manager.cc

Index: ash/common/wm/panels/panel_layout_manager.cc
diff --git a/ash/common/wm/panels/panel_layout_manager.cc b/ash/common/wm/panels/panel_layout_manager.cc
index 07f1a7a94d087dd62da36fccadebde5ac9e32507..6acd55a2e7bedba7622f9ce2a98811a44941cc26 100644
--- a/ash/common/wm/panels/panel_layout_manager.cc
+++ b/ash/common/wm/panels/panel_layout_manager.cc
@@ -77,10 +77,10 @@ class CalloutWidgetBackground : public views::Background {
         break;
     }
     // Hard code the arrow color for now.
-    cc::PaintFlags paint;
-    paint.setStyle(cc::PaintFlags::kFill_Style);
-    paint.setColor(SkColorSetARGB(0xff, 0xe5, 0xe5, 0xe5));
-    canvas->DrawPath(path, paint);
+    cc::PaintFlags flags;
+    flags.setStyle(cc::PaintFlags::kFill_Style);
+    flags.setColor(SkColorSetARGB(0xff, 0xe5, 0xe5, 0xe5));
+    canvas->DrawPath(path, flags);
   }
 
   ShelfAlignment alignment() { return alignment_; }