Target Builder: 
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests

First build failed:
https://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/45916

Failure log:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.linux%2FAndroid_Tests%2F45916%2F%2B%2Frecipes%2Fsteps%2Funit_tests_on_Android%2F0%2Flogs%2FExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeUnknown%2F0

[ RUN      ] FamilyInfoFetcherTest.FailedResponse
[       OK ] FamilyInfoFetcherTest.FailedResponse (0 ms)
[----------] 7 tests from FamilyInfoFetcherTest (3 ms total)
[----------] Global test environment tear-down
[==========] 94 tests from 14 test cases ran. (818 ms total)
[  PASSED  ] 90 tests.
[  FAILED  ] 4 tests, listed below:
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnBlockedChromeOtherModeDefault
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeNotDefault
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeUnknown
[ RUN      ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeOtherModeDefault
../../chrome/browser/external_protocol/external_protocol_handler_unittest.cc:146: Failure
      Expected: expected_action == Action::PROMPT
      Which is: true
To be equal to: delegate_.has_prompted()
      Which is: false
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeOtherModeDefault (8 ms)
[----------] 4 tests from ExternalProtocolHandlerTest (57 ms total)
[----------] Global test environment tear-down
[==========] 4 tests from 1 test case ran. (59 ms total)
[  PASSED  ] 1 test.
[  FAILED  ] 3 tests, listed below:
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeNotDefault
[  FAILED  ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeUnknown
[ RUN      ] ExternalProtocolHandlerTest.TestLaunchSchemeUnknownChromeUnknown
[ CRASHED      ]