Improve console message about deferring long-running timers.

components/scheduler/renderer/renderer_scheduler_impl.cc

Index: components/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.cc b/components/scheduler/renderer/renderer_scheduler_impl.cc
index 135cdabc2486402b877738d7df5b405f279ba045..a88c3cd6762f041679ce64fc405f14ee4991923f 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -1315,8 +1315,8 @@ void RendererSchedulerImpl::OnTriedToExecuteBlockedTask(
     MainThreadOnly().have_reported_blocking_intervention_since_navigation =
         true;
     BroadcastConsoleWarning(
-        "Deferred long-running timer task(s) to improve scrolling smoothness. "
-        "See crbug.com/574343.");
+        "Defer long-running timer task(s) to improve scrolling smoothness. "

[Sami, 2016/05/23 13:16:37]

What the message is trying to communicate is that the *browser* deferred some
tasks in favor of making scrolling smoother. The guidance for the web developer
should basically be: make sure your timer tasks take less than 50ms to run. (The
limit is about 6ms during user gestures, but I think we might want to avoid
printing the warning in that case since it is pretty spammy right now).

+        "See https://crbug.com/574343#c40");
   }
 }