DevTools: update ViewportDataGrid resizers when scrollbar visibility changes

third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js

Index: third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js b/third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js
index 222d7762ab96ea067766c1d23bdfd214e2faa279..c1ca48c7a456deb43e5bfc3996f0df2d1bb20d3e 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui_lazy/ViewportDataGrid.js
@@ -237,11 +237,14 @@ WebInspector.ViewportDataGrid.prototype = {
         }
 
         this.setVerticalPadding(viewportState.topPadding, viewportState.bottomPadding);
-        var contentFits = viewportState.contentHeight <= clientHeight;
-        this.element.classList.toggle("data-grid-fits-viewport", contentFits && viewportState.topPadding + viewportState.bottomPadding === 0);
         this._lastScrollTop = scrollTop;
         if (scrollTop !== currentScrollTop)
             this._scrollContainer.scrollTop = scrollTop;
+        var contentFits = viewportState.contentHeight <= clientHeight && viewportState.topPadding + viewportState.bottomPadding === 0;
+        if (contentFits !== this.element.classList.contains("data-grid-fits-viewport")) {
+            this.element.classList.toggle("data-grid-fits-viewport", contentFits);
+            this.updateWidths();
+        }
         this._visibleNodes = visibleNodes;
     },