Collect garbage at the beginning of cctest/test-cpu-profiler/FunctionCallSample

test/cctest/test-cpu-profiler.cc

Index: test/cctest/test-cpu-profiler.cc
diff --git a/test/cctest/test-cpu-profiler.cc b/test/cctest/test-cpu-profiler.cc
index e880d17f1b79574dd5af8ad407658e3d0b0ea261..e4ef412e32514497a1ddcc23cb28f7f7829088a4 100644
--- a/test/cctest/test-cpu-profiler.cc
+++ b/test/cctest/test-cpu-profiler.cc
@@ -40,6 +40,7 @@ using i::CodeEntry;
 using i::CpuProfile;
 using i::CpuProfiler;
 using i::CpuProfilesCollection;
+using i::Heap;
 using i::ProfileGenerator;
 using i::ProfileNode;
 using i::ProfilerEventsProcessor;
@@ -995,6 +996,9 @@ TEST(FunctionCallSample) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
+  // Collect garbage that might have be generated while installing extensions.
+  HEAP->CollectAllGarbage(Heap::kNoGCFlags);
+
   v8::Script::Compile(v8::String::New(call_function_test_source))->Run();
   v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(
       env->Global()->Get(v8::String::New("start")));