Chrome Version       : 53.0.2785.143
OS Version: 
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari 5:
  Firefox 4.x:
     IE 7/8/9:

What steps will reproduce the problem?
1.
2.
3.

What is the expected result?


What happens instead of that?


Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36



 

Flainess dashboard:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=components_unittests&tests=ContentSerializedNavigationBuilderTest.ToNavigationEntry


This test is flaking locally for me with log messages like:

[44162:44162:1005/153254:7794983243112:FATAL:content_serialized_navigation_driver.cc(155)] Check failed: !extended_info_handler_map_.count(key). 
#0 0x7f2915028b1e base::debug::StackTrace::StackTrace()
#1 0x7f291509695f logging::LogMessage::~LogMessage()
#2 0x7f291059eea7 sessions::ContentSerializedNavigationDriver::RegisterExtendedInfoHandler()
#3 0x00000162d0fe sessions::(anonymous namespace)::SetExtendedInfoForTest()
#4 0x00000162d262 sessions::ContentSerializedNavigationBuilderTest_ToNavigationEntry_Test::TestBody()

This assertion as added by jianli in https://codereview.chromium.org/2310363002