Take 2 at removing thumb thickness compositor setting.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index c89f6fdcd6a467313fc3fc2f6968d32533667668..06424cd92a1f1d43cbc5bffc66c9e8ac61a3de97 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -272,7 +272,6 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
       cmd->HasSwitch(switches::kHideScrollbars)
           ? SK_ColorTRANSPARENT
           : SkColorSetARGB(128, 128, 128, 128);
-  settings.solid_color_scrollbar_thickness_dip = 3;
   settings.highp_threshold_min = 2048;
   // Android WebView handles root layer flings itself.
   settings.ignore_root_layer_flings =
@@ -285,7 +284,6 @@ scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
   if (cmd->HasSwitch(cc::switches::kEnablePinchVirtualViewport) ||
       cmd->HasSwitch(switches::kEnableOverlayScrollbars)) {
     settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
-    settings.solid_color_scrollbar_thickness_dip = 7;
   }
 #endif