Enable cpplint for webrtc/examples and fix all uncovered cpplint errors.

webrtc/examples/peerconnection/client/main_wnd.h

Index: webrtc/examples/peerconnection/client/main_wnd.h
diff --git a/webrtc/examples/peerconnection/client/main_wnd.h b/webrtc/examples/peerconnection/client/main_wnd.h
index 9f61a568fd22a87f4e4469dcc71aadd03db17201..ac4fd8a9b98dcb1a73b793b9679a8fa83420444c 100644
--- a/webrtc/examples/peerconnection/client/main_wnd.h
+++ b/webrtc/examples/peerconnection/client/main_wnd.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef PEERCONNECTION_SAMPLES_CLIENT_MAIN_WND_H_
-#define PEERCONNECTION_SAMPLES_CLIENT_MAIN_WND_H_
+#ifndef WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_MAIN_WND_H_
+#define WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_MAIN_WND_H_
 #pragma once
 
 #include <map>
@@ -60,7 +60,8 @@ class MainWindow {
 
   virtual void StartLocalRenderer(webrtc::VideoTrackInterface* local_video) = 0;
   virtual void StopLocalRenderer() = 0;
-  virtual void StartRemoteRenderer(webrtc::VideoTrackInterface* remote_video) = 0;
+  virtual void StartRemoteRenderer(
+      webrtc::VideoTrackInterface* remote_video) = 0;
   virtual void StopRemoteRenderer() = 0;
 
   virtual void QueueUIThreadCallback(int msg_id, void* data) = 0;
@@ -197,4 +198,4 @@ class MainWnd : public MainWindow {
 };
 #endif  // WIN32
 
-#endif  // PEERCONNECTION_SAMPLES_CLIENT_MAIN_WND_H_
+#endif  // WEBRTC_EXAMPLES_PEERCONNECTION_CLIENT_MAIN_WND_H_