I bow down before Dean and his "I don't need sleep, I'll just read every line of code" ways.

webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp

Index: webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp
diff --git a/webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp b/webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp
index 008b875a1992bfe07101e0ccf703da11b8677b3d..f052d929d07b38cb5da8bcf3ee0655fa07a28efb 100644
--- a/webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp
+++ b/webkit/port/platform/chromium/ScrollbarThemeChromiumLinux.cpp
@@ -134,7 +134,7 @@ void ScrollbarThemeChromium::paintButton(GraphicsContext* gc, Scrollbar* scrollb
     SkPaint paint;
     paint.setARGB(255, 0, 255, 128);
     SkRect skrect;
-    skrect.set(rect.x(), rect.y(), rect.x() + rect.width() - 1, rect.y() + rect.height() + 1);
+    skrect.set(rect.x(), rect.y(), rect.x() + rect.width() - 1, rect.y() + rect.height() - 1);
     gc->platformContext()->canvas()->drawRect(skrect, paint);
 
     const bool horz = scrollbar->orientation() == HorizontalScrollbar;