Fix some chromium-style warnings in webrtc/tools/

BUG=163
R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1908004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4427 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/tools/simple_command_line_parser.cc b/webrtc/tools/simple_command_line_parser.cc
index d7757ed..d6a8c1b 100644
--- a/webrtc/tools/simple_command_line_parser.cc
+++ b/webrtc/tools/simple_command_line_parser.cc
@@ -19,6 +19,9 @@
 
 using std::string;
 
+CommandLineParser::CommandLineParser() {}
+CommandLineParser::~CommandLineParser() {}
+
 void CommandLineParser::Init(int argc, char** argv) {
   args_ = std::vector<std::string> (argv + 1, argv + argc);
 }