systrace: remove the use of a Python 2.7 function
systrace: remove the use of a Python 2.7 function

Change-Id: Ic0f4890d450541736f5909273cabcbad2ba3e3fe

Omegaphora/external_chromium-trace,Omegaphora/external_chromium-trace,xin3liang/platform_external_chromium-trace,xin3liang/platform_external_chromium-trace,xin3liang/platform_external_chromium-trace,VanirAOSP/external_chromium-trace,mer-tools/chromium-trace,geekboxzone/lollipop_external_chromium-trace,android-ia/platform_external_chromium-trace,xin3liang/platform_external_chromium-trace,mer-tools/chromium-trace,mer-tools/chromium-trace,VanirAOSP/external_chromium-trace,mer-tools/chromium-trace,android-ia/platform_external_chromium-trace,android-ia/platform_external_chromium-trace,Omegaphora/external_chromium-trace,geekboxzone/lollipop_external_chromium-trace,mer-tools/chromium-trace,Omegaphora/external_chromium-trace,xin3liang/platform_external_chromium-trace,geekboxzone/lollipop_external_chromium-trace,android-ia/platform_external_chromium-trace,VanirAOSP/external_chromium-trace,VanirAOSP/external_chromium-trace,VanirAOSP/external_chromium-trace,geekboxzone/lollipop_external_chromium-trace