Unflake CPU profiler tests.

test/cctest/profiler-extension.h

Index: test/cctest/profiler-extension.h
diff --git a/test/cctest/profiler-extension.h b/test/cctest/profiler-extension.h
index e63d374fb51194f062e0ffd0960f2a61a2760715..00f9a5a8085fe62c40f0f31202c69fef2efb5852 100644
--- a/test/cctest/profiler-extension.h
+++ b/test/cctest/profiler-extension.h
@@ -40,10 +40,13 @@ class ProfilerExtension : public v8::Extension {
   ProfilerExtension() : v8::Extension("v8/profiler", kSource) { }
   virtual v8::Local<v8::FunctionTemplate> GetNativeFunctionTemplate(
       v8::Isolate* isolate, v8::Local<v8::String> name);
-  static void StartProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void StopProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
   static v8::CpuProfile* last_profile;
+
  private:
+  static void StartProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void StopProfiling(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void CollectSample(const v8::FunctionCallbackInfo<v8::Value>& args);
+
   static const char* kSource;
 };