Revert 242671 "Implement sampling profiler (chromium side change)"

trunk/src/content/browser/tracing/tracing_controller_impl.cc

Index: trunk/src/content/browser/tracing/tracing_controller_impl.cc
===================================================================
--- trunk/src/content/browser/tracing/tracing_controller_impl.cc	(revision 242678)
+++ trunk/src/content/browser/tracing/tracing_controller_impl.cc	(working copy)
@@ -80,7 +80,7 @@
 
 void TracingControllerImpl::ResultFile::WriteTask(
     const scoped_refptr<base::RefCountedString>& events_str_ptr) {
-  if (!file_ || !events_str_ptr->data().size())
+  if (!file_)
     return;
 
   // If there is already a result in the file, then put a commma
@@ -173,9 +173,7 @@
   // TODO(haraken): How to handle ENABLE_SYSTRACE?
 
   TraceLog::GetInstance()->SetEnabled(
-      base::debug::CategoryFilter(category_filter),
-      base::debug::TraceLog::RECORDING_MODE,
-      trace_options);
+      base::debug::CategoryFilter(category_filter), trace_options);
   is_recording_ = true;
 
   // Notify all child processes.
@@ -249,11 +247,10 @@
 
   int monitoring_tracing_options = 0;
   if (options & ENABLE_SAMPLING)
-    monitoring_tracing_options |= base::debug::TraceLog::ENABLE_SAMPLING;
+    monitoring_tracing_options |= base::debug::TraceLog::MONITOR_SAMPLING;
 
   TraceLog::GetInstance()->SetEnabled(
       base::debug::CategoryFilter(category_filter),
-      base::debug::TraceLog::MONITORING_MODE,
       static_cast<TraceLog::Options>(monitoring_tracing_options));
 
   // Notify all child processes.
@@ -428,11 +425,6 @@
         TraceLog::GetInstance()->GetCurrentCategoryFilter().ToString(),
         TraceLog::GetInstance()->trace_options());
   }
-  if (can_disable_monitoring()) {
-    trace_message_filter->SendEnableMonitoring(
-        TraceLog::GetInstance()->GetCurrentCategoryFilter().ToString(),
-        TraceLog::GetInstance()->trace_options());
-  }
 }
 
 void TracingControllerImpl::RemoveTraceMessageFilter(