Task Manager: Remove dead FPS code.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 25d8f766e5961b3de5abd1de3859d7d7ebbd0fd9..97c087398915b958dda263b449f348c7bc48e77b 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2363,10 +2363,6 @@ bool RenderViewImpl::GetContentStateImmediately() const {
   return send_content_state_immediately_;
 }
 
-float RenderViewImpl::GetFilteredTimePerFrame() const {
-  return 0.0f;
-}
-
 blink::WebPageVisibilityState RenderViewImpl::GetVisibilityState() const {
   return visibilityState();
 }