Fix for content_unit_tests introduced in r151387

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 6bdc9b64313cbdfb162a36c645e66e1053d0585a..5488fb0d45192df48b247eb6f9c004b0bc483f21 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -314,8 +314,10 @@ RenderThreadImpl::~RenderThreadImpl() {
   if (file_thread_.get())
     file_thread_->Stop();
 
-  RemoveFilter(compositor_output_surface_filter_.get());
-  compositor_output_surface_filter_ = NULL;
+  if (compositor_output_surface_filter_.get()) {
+    RemoveFilter(compositor_output_surface_filter_.get());
+    compositor_output_surface_filter_ = NULL;
+  }
 
   if (compositor_initialized_) {
     WebKit::WebCompositor::shutdown();