Revert 180822 "Specify clip rects when drawing Mac native widgets"

Source/platform/scroll/ScrollbarThemeMacNonOverlayAPI.mm

Index: Source/platform/scroll/ScrollbarThemeMacNonOverlayAPI.mm
===================================================================
--- Source/platform/scroll/ScrollbarThemeMacNonOverlayAPI.mm	(revision 181329)
+++ Source/platform/scroll/ScrollbarThemeMacNonOverlayAPI.mm	(working copy)
@@ -33,7 +33,6 @@
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
-#include "platform/mac/ThemeMac.h"
 #include "platform/scroll/ScrollbarThemeClient.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebRect.h"
@@ -136,7 +135,7 @@
     }
 
     // Draw thumbless.
-    gfx::SkiaBitLocker bitLocker(drawingContext->canvas(), ThemeMac::inflateRectForAA(scrollbar->frameRect()));
+    gfx::SkiaBitLocker bitLocker(drawingContext->canvas());
     CGContextRef cgContext = bitLocker.cgContext();
     HIThemeDrawTrack(&trackInfo, 0, cgContext, kHIThemeOrientationNormal);