GetSignatureResultHistogram  601 chrome/browser/extensions/install_verifier.cc     GetSignatureResultHistogram(CALLBACK_NO_SIGNATURE);
GetSignatureResultHistogram  603 chrome/browser/extensions/install_verifier.cc     GetSignatureResultHistogram(CALLBACK_INVALID_SIGNATURE);
GetSignatureResultHistogram  605 chrome/browser/extensions/install_verifier.cc     GetSignatureResultHistogram(CALLBACK_VALID_SIGNATURE);