Revert of Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/core/frame/VisualViewport.cpp

Index: third_party/WebKit/Source/core/frame/VisualViewport.cpp
diff --git a/third_party/WebKit/Source/core/frame/VisualViewport.cpp b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
index df1fb529343285c916cae67c852015e1d8f153e6..eb0b00295e8bf348b8b6580eba9a624c47ad10b9 100644
--- a/third_party/WebKit/Source/core/frame/VisualViewport.cpp
+++ b/third_party/WebKit/Source/core/frame/VisualViewport.cpp
@@ -543,6 +543,12 @@
     return frame->view()->visibleContentRect(IncludeScrollbars).size();
 }
 
+void VisualViewport::invalidateScrollbarRect(Scrollbar*, const IntRect&)
+{
+    // Do nothing. Visual scrollbars live on the compositor thread and will
+    // be updated when the viewport is synced to the CC.
+}
+
 void VisualViewport::setScrollOffset(const IntPoint& offset, ScrollType scrollType)
 {
     setScrollOffset(DoublePoint(offset), scrollType);