Fix typo in TODO

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

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 1c1cd08ef96cd70a535ab4a10241e537f9f35fe9..fb57248271abdc76a9e5e591f8c3b5e6902f4951 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2685,7 +2685,7 @@ void FrameView::synchronizedPaint()
     }
 
     // TODO(sataya.m):Main frame doesn't create RootFrameViewport in some
-    // webkit_unit_tests (http://crbug.com/607987).
+    // webkit_unit_tests (http://crbug.com/644788).
     if (m_viewportScrollableArea) {
         if (GraphicsLayer* layerForHorizontalScrollbar = m_viewportScrollableArea->layerForHorizontalScrollbar()) {
             synchronizedPaintRecursively(layerForHorizontalScrollbar);