Refactor trace_event_impl's SetEnabled to use TraceOptions. Propagate this through the whole stack.

content/renderer/devtools/devtools_agent.cc

Index: content/renderer/devtools/devtools_agent.cc
diff --git a/content/renderer/devtools/devtools_agent.cc b/content/renderer/devtools/devtools_agent.cc
index a3c37b62d4a85dc92f418119ca7b906c5f6ae2cd..18bd3ef3356183af93811f33881d82381f1650da 100644
--- a/content/renderer/devtools/devtools_agent.cc
+++ b/content/renderer/devtools/devtools_agent.cc
@@ -44,6 +44,7 @@ using blink::WebVector;
 using blink::WebView;
 
 using base::debug::TraceLog;
+using base::debug::TraceOptions;
 
 namespace content {
 
@@ -173,7 +174,7 @@ void DevToolsAgent::enableTracing(const WebString& category_filter) {
   TraceLog* trace_log = TraceLog::GetInstance();
   trace_log->SetEnabled(base::debug::CategoryFilter(category_filter.utf8()),
                         TraceLog::RECORDING_MODE,
-                        TraceLog::RECORD_UNTIL_FULL);
+                        TraceOptions());
 }
 
 void DevToolsAgent::disableTracing() {