Remove the NOTREACHED introduced by crrev.com/2323483005.

base/trace_event/trace_log.cc

Index: base/trace_event/trace_log.cc
diff --git a/base/trace_event/trace_log.cc b/base/trace_event/trace_log.cc
index a3d146ad51451be1fd15c4d1295f66eb325b383f..8ec5dc5a44878eb7b8db2bec6f2ad0526db7d2c4 100644
--- a/base/trace_event/trace_log.cc
+++ b/base/trace_event/trace_log.cc
@@ -746,7 +746,8 @@ void TraceLog::SetEnabled(const TraceConfig& trace_config,
     InternalTraceOptions old_options = trace_options();
 
     if (dispatching_to_observer_list_) {
-      NOTREACHED()
+      // TODO(ssid): Change to NOTREACHED after fixing crbug.com/625170.
+      DLOG(ERROR)
           << "Cannot manipulate TraceLog::Enabled state from an observer.";
       return;
     }
@@ -875,7 +876,7 @@ void TraceLog::SetDisabledWhileLocked(uint8_t modes_to_disable) {
     return;
 
   if (dispatching_to_observer_list_) {
-    NOTREACHED()
+    DLOG(ERROR)

[Ilya Kulshin, 2016/10/13 23:35:07]

Add TODO here, similar to the previous call.

         << "Cannot manipulate TraceLog::Enabled state from an observer.";
     return;
   }