Dismiss tooltip on all scrolls, not just frame scrolls.

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index cb5500a93959ed72957af3adadf0b1c9d534d3bc..ddffbe83f9ef9a4138e48939a3035d987b2a17cb 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -375,6 +375,10 @@ void PaintLayerScrollableArea::setScrollOffset(const DoublePoint& newScrollOffse
     quadForFakeMouseMoveEvent = paintInvalidationContainer.localToAbsoluteQuad(quadForFakeMouseMoveEvent);
     frame->eventHandler().dispatchFakeMouseMoveEventSoonInQuad(quadForFakeMouseMoveEvent);
 
+    Page* page = frame->page();
+    if (page)
+        page->chromeClient().clearToolTip();
+
     bool requiresPaintInvalidation = true;
 
     if (box().view()->compositor()->inCompositingMode()) {