Add OnBeforeTraceLogDisabled notification to EnabledStateObserver

content/browser/tracing/tracing_controller_impl.cc

Index: content/browser/tracing/tracing_controller_impl.cc
diff --git a/content/browser/tracing/tracing_controller_impl.cc b/content/browser/tracing/tracing_controller_impl.cc
index 2ca4738857a0c9e97c7b525bf1e7ecbdb8721c7c..7f9ba7e0914f545170e82d0eb412bd13262024bb 100644
--- a/content/browser/tracing/tracing_controller_impl.cc
+++ b/content/browser/tracing/tracing_controller_impl.cc
@@ -673,10 +673,10 @@ void TracingControllerImpl::OnStopTracingAcked(
     // During or after this call, our OnLocalTraceDataCollected will be
     // called with the last of the local trace data.
     if (trace_data_sink_) {
-    TraceLog::GetInstance()->Flush(
-        base::Bind(&TracingControllerImpl::OnLocalTraceDataCollected,
-                   base::Unretained(this)),
-        true);
+      TraceLog::GetInstance()->Flush(
+          base::Bind(&TracingControllerImpl::OnLocalTraceDataCollected,
+                     base::Unretained(this)),
+          true);
     } else {
       TraceLog::GetInstance()->CancelTracing(
           base::Bind(&TracingControllerImpl::OnLocalTraceDataCollected,