message: Updated profile_buffer_test.cc
  Fixed the warning in the file
diff: @@ -27,7 +27,7 @@ namespace {
  std::vector<const ProfileEvent*> GetProfileEvents(const ProfileBuffer& buffer) {
  std::vector<const ProfileEvent*> events;
  - for (auto i = 0; i < buffer.Size(); i++) {
  + for (size_t i = 0; i < buffer.Size(); i++) {
  events.push_back(buffer.At(i));
  }
  return events;
  @@ -69,7 +69,7 @@ TEST(ProfileBufferTest, OverFlow) {
  EXPECT_EQ(expected_size, buffer.Size());
  }
  EXPECT_EQ(max_size, buffer.Size());
  - for (int j = 0; j < buffer.Size(); ++j) {
  + for (size_t j = 0; j < buffer.Size(); ++j) {
  auto event = buffer.At(j);
  EXPECT_EQ(eventNames[j % 4], event->tag);
  EXPECT_EQ(ProfileEvent::EventType::DEFAULT, event->event_type);
  