Allow use of the chrome trace categories string from the tracing ui internals.

content/browser/trace_controller_impl.cc

Index: content/browser/trace_controller_impl.cc
diff --git a/content/browser/trace_controller_impl.cc b/content/browser/trace_controller_impl.cc
index 0c5d5cdfbb5a9598e1ce963956dcaa23578f3d5b..91640fcb97a5db826d4927e4daf7cb8ac8266236 100644
--- a/content/browser/trace_controller_impl.cc
+++ b/content/browser/trace_controller_impl.cc
@@ -109,18 +109,12 @@ bool TraceControllerImpl::GetKnownCategoriesAsync(TraceSubscriber* subscriber) {
   // message. So to get known categories, just begin and end tracing immediately
   // afterwards. This will ping all the child processes for categories.
   is_get_categories_ = true;
-  bool success = BeginTracing(subscriber) && EndTracingAsync(subscriber);
+  bool success = BeginTracing(subscriber, "*") &&
+                 EndTracingAsync(subscriber);
   is_get_categories_ = success;
   return success;
 }
 
-bool TraceControllerImpl::BeginTracing(TraceSubscriber* subscriber) {
-  std::vector<std::string> include, exclude;
-  // By default, exclude all categories that begin with test_
-  exclude.push_back("test_*");
-  return BeginTracing(subscriber, include, exclude);
-}
-
 bool TraceControllerImpl::BeginTracing(
     TraceSubscriber* subscriber,
     const std::vector<std::string>& included_categories,