Add OnBeforeTraceLogDisabled notification to EnabledStateObserver

content/browser/tracing/tracing_controller_impl.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #include "content/browser/tracing/tracing_controller_impl.h"
 
 #include "base/bind.h"
 #include "base/cpu.h"
 #include "base/files/file_util.h"
 #include "base/guid.h"
 #include "base/json/string_escape.h"
@@ skipping 655 matching lines @@
       !pending_stop_tracing_filters_.erase(trace_message_filter)) {
     // The response from the specified message filter has already been received.
     return;
   }
 
   if (--pending_stop_tracing_ack_count_ == 1) {
     // All acks from subprocesses have been received. Now flush the local trace.
     // 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,
                      base::Unretained(this)));
     }
     return;
   }
 
   if (pending_stop_tracing_ack_count_ != 0)
     return;
@@ skipping 426 matching lines @@
   // Schedule the next queued dump (if applicable).
   if (!queued_memory_dump_requests_.empty()) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&TracingControllerImpl::PerformNextQueuedGlobalMemoryDump,
                    base::Unretained(this)));
   }
 }
 
 }  // namespace content