Mark Mentovai 899821d4c7 Fix -Winconsistent-missing-override in CrashReportUploadThread
Chromium builds with a newer clang than the Crashpad buildbot, and it
reports:

../../../handler/crash_report_upload_thread.cc:148:16: error: 'ThreadMain' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  virtual void ThreadMain() {
               ^
../../../util/thread/thread.h:46:16: note: overridden virtual function is here
  virtual void ThreadMain() = 0;
               ^
1 error generated.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/1302833002 .
2015-08-19 22:41:46 -04:00
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