[SP] Turn off slimming paint by default.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index e0eb5dc42c629c922eee850a98fe2945752f9611..6a8e0f7afc8795ddbb2047c5ef6a8e39fe1b89b7 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -468,8 +468,7 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
       !command_line.HasSwitch(switches::kDisableTouchAdjustment);
 
   prefs.slimming_paint_enabled = command_line.HasSwitch(
-      switches::kEnableSlimmingPaint) ||
-      !command_line.HasSwitch(switches::kDisableSlimmingPaint);
+      switches::kEnableSlimmingPaint);
 
 #if defined(OS_MACOSX) || defined(OS_CHROMEOS)
   bool default_enable_scroll_animator = true;