Link to Builds:
===============
https://uberchromegw.corp.google.com/i/official.desktop/builders/mac64/builds/1543

Link to Log File:
=================
https://uberchromegw.corp.google.com/i/official.desktop/builders/mac64/builds/1543/steps/compile/logs/stdio

Error from the Log:
===================
FAILED: WidevineCdm/_platform_specific/mac_x64/widevinecdmadapter.plugin.sig 
python ../../third_party/widevine/scripts/signature_generator.py --input_file WidevineCdm/_platform_specific/mac_x64/widevinecdmadapter.plugin --output_file WidevineCdm/_platform_specific/mac_x64/widevinecdmadapter.plugin.sig
Traceback (most recent call last):
  File "../../third_party/widevine/scripts/signature_generator.py", line 120, in <module>
    args.passphrase_debug, args.flags))
  File "../../third_party/widevine/scripts/signature_generator.py", line 76, in _GenerateSignatureFile
    import signer
  File "/b/build/slave/mac64/build/src/third_party/widevine/scripts/signer.py", line 17, in <module>
    from cryptography import x509
ImportError: No module named cryptography
[15479/50240] CC obj/third_party/yasm/yasm/nasm-token.o
[15480/50240] LINK ./crdmg
[15481/50240] CXX obj/tools/gn/gn_lib/c_include_iterator.o
[15482/50240] CXX obj/tools/gn/gn_lib/builder_record.o
[15483/50240] CXX obj/tools/gn/gn_lib/action_values.o
[15484/50240] CXX obj/third_party/woff2/woff2_dec/woff2_dec.o
[15485/50240] CXX obj/tools/gn/gn_lib/build_settings.o
[15486/50240] CC obj/third_party/yasm/yasm/nasm-pp.o
[15487/50240] CXX obj/tools/gn/gn_lib/bundle_file_rule.o
[15488/50240] CXX obj/tools/gn/gn_lib/bundle_data_target_generator.o
[15489/50240] CXX obj/tools/gn/gn_lib/action_target_generator.o
[15490/50240] CC obj/third_party/yasm/yasm/bitvect.o
[15491/50240] CXX obj/tools/gn/gn_lib/command_analyze.o
[15492/50240] CXX obj/tools/gn/gn_lib/err.o
[15493/50240] CXX obj/tools/gn/gn_lib/binary_target_generator.o
[15494/50240] CXX obj/tools/gn/gn_lib/command_clean.o
[15495/50240] CXX obj/tools/gn/gn_lib/args.o
[15496/50240] CXX obj/tools/gn/gn_lib/bundle_data.o
[15497/50240] CXX obj/tools/gn/gn_lib/command_check.o
[15498/50240] CXX obj/tools/gn/gn_lib/command_args.o
[15499/50240] CXX obj/tools/gn/gn_lib/builder.o
[15500/50240] CXX obj/tools/gn/gn_lib/command_desc.o
[15501/50240] CXX obj/tools/gn/gn_lib/command_gen.o
[15502/50240] CXX obj/tools/gn/gn_lib/analyzer.o
[15503/50240] CXX obj/tools/gn/gn_lib/command_format.o
ninja: build stopped: subcommand failed.

/b/build/scripts/slave/gsutil cp file:///tmp/tmpAfeFoC gs://chrome-goma-log/2017/02/24/osx-3-m0/ninja_log.osx-3-m0.chrome-bot.20170223-202806.49450.gz
Copying file:///tmp/tmpAfeFoC [Content-Type=application/octet-stream]...
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 0 B/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 72 KiB/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 144 KiB/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 216 KiB/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 288 KiB/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 360 KiB/399.55 KiB    
Uploading   ...log.osx-3-m0.chrome-bot.20170223-202806.49450.gz: 399.55 KiB/399.55 KiB    
Copied log file to gs://chrome-goma-log/2017/02/24/osx-3-m0/ninja_log.osx-3-m0.chrome-bot.20170223-202806.49450.gz
Visualization at http://chromium-build-stats.appspot.com/ninja_log/2017/02/24/osx-3-m0/ninja_log.osx-3-m0.chrome-bot.20170223-202806.49450.gz
program finished with exit code 1
elapsedTime=1075.186826

Assigning to the concern owner from the below CL --
https://chromium.googlesource.com/chromium/src/+log/58.0.3021.0..58.0.3022.0?pretty=fuller&n=10000

Suspecting Commit#
https://chromium.googlesource.com/chromium/src/+/5762e61a17e4e05c490be128fd96204f24c1a457

@jrummell -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.