Make sure the thread calling CoCreateGuid is CoInitialized.

base/win/event_trace_consumer_unittest.cc

Index: base/win/event_trace_consumer_unittest.cc
diff --git a/base/win/event_trace_consumer_unittest.cc b/base/win/event_trace_consumer_unittest.cc
index d3ba0f383280e9f6bb3346bee52512f664bff387..e8157761d0cb8bb3669a0811a24cda01940fec35 100644
--- a/base/win/event_trace_consumer_unittest.cc
+++ b/base/win/event_trace_consumer_unittest.cc
@@ -18,6 +18,7 @@
 #include "base/stringprintf.h"
 #include "base/win/event_trace_controller.h"
 #include "base/win/event_trace_provider.h"
+#include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_handle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -103,6 +104,7 @@ class EtwTraceConsumerBaseTest: public testing::Test {
   }
 
  protected:
+  base::win::ScopedCOMInitializer com_initializer_;
   GUID test_provider_;
   std::wstring session_name_;
 };
@@ -243,8 +245,7 @@ DEFINE_GUID(kTestEventType,
 
 }  // namespace
 
-// Fails consistently on Vista. http://crbug.com/127671
-TEST_F(EtwTraceConsumerRealtimeTest, DISABLED_ConsumeEvent) {
+TEST_F(EtwTraceConsumerRealtimeTest, ConsumeEvent) {
   EtwTraceController controller;
   HRESULT hr = controller.StartRealtimeSession(session_name_.c_str(),
                                                100 * 1024);