Fix cpplint errors in locations that are already being checked

webrtc/modules/video_coding/jitter_estimator_tests.cc

 /*  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/modules/video_coding/jitter_estimator.h"
@@ skipping 28 matching lines @@
 
   virtual void SetUp() { regular_estimator_.Reset(); }
 
   TestEstimator regular_estimator_;
   TestEstimator low_rate_estimator_;
 };
 
 // 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_; }
 
   uint32_t FrameSize() { return 1000 + Delay(); }
 
   void Advance() { ++counter_; }
 
  private:
   const int32_t amplitude_;
@@ skipping 90 matching lines @@
       break;
     }
 
     gen.Advance();
   }
 
   EXPECT_NE(regular_iterations, 0);
   EXPECT_NE(low_rate_iterations, 0);
   EXPECT_LE(low_rate_iterations, regular_iterations);
 }
-}
+}  // namespace webrtc