ui: Clean up naming of paint-related identifiers

ui/views/bubble/tray_bubble_view.cc

Index: ui/views/bubble/tray_bubble_view.cc
diff --git a/ui/views/bubble/tray_bubble_view.cc b/ui/views/bubble/tray_bubble_view.cc
index 4aa577ac300fbee463782e13908f6d9a83ee3cf7..3d7a93eecae09d4b4d6f03ab71aef2e27a33c54c 100644
--- a/ui/views/bubble/tray_bubble_view.cc
+++ b/ui/views/bubble/tray_bubble_view.cc
@@ -113,11 +113,11 @@ TrayBubbleContentMask::~TrayBubbleContentMask() {
 
 void TrayBubbleContentMask::OnPaintLayer(const ui::PaintContext& context) {
   ui::PaintRecorder recorder(context, layer()->size());
-  cc::PaintFlags paint;
-  paint.setAlpha(255);
-  paint.setStyle(cc::PaintFlags::kFill_Style);
+  cc::PaintFlags flags;
+  flags.setAlpha(255);
+  flags.setStyle(cc::PaintFlags::kFill_Style);
   gfx::Rect rect(layer()->bounds().size());
-  recorder.canvas()->DrawRoundRect(rect, corner_radius_, paint);
+  recorder.canvas()->DrawRoundRect(rect, corner_radius_, flags);
 }
 
 void TrayBubbleContentMask::OnDeviceScaleFactorChanged(