Fix cpplint errors in locations that are already being checked

webrtc/modules/video_coding/jitter_estimator_tests.cc

Index: webrtc/modules/video_coding/jitter_estimator_tests.cc
diff --git a/webrtc/modules/video_coding/jitter_estimator_tests.cc b/webrtc/modules/video_coding/jitter_estimator_tests.cc
index e2fd9f758ab88e3ef45dda9c4fbdc2cb66655071..04480a7c2f8ed97273d3810061617b74e95bbb71 100644
--- a/webrtc/modules/video_coding/jitter_estimator_tests.cc
+++ b/webrtc/modules/video_coding/jitter_estimator_tests.cc
@@ -46,7 +46,8 @@ class TestVCMJitterEstimator : public ::testing::Test {
 // Generates some simple test data in the form of a sawtooth wave.
 class ValueGenerator {
  public:
-  ValueGenerator(int32_t amplitude) : amplitude_(amplitude), counter_(0) {}
+  explicit ValueGenerator(int32_t amplitude)
+      : amplitude_(amplitude), counter_(0) {}
   virtual ~ValueGenerator() {}
 
   int64_t Delay() { return ((counter_ % 11) - 5) * amplitude_; }
@@ -157,4 +158,4 @@ TEST_F(TestVCMJitterEstimator, TestConvergence) {
   EXPECT_NE(low_rate_iterations, 0);
   EXPECT_LE(low_rate_iterations, regular_iterations);
 }
-}
+}  // namespace webrtc