Revert of Update usage of linux blink try bot to use linux_trusty_blink_rel.

tools/release/auto_roll.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import os
 import sys
 
 from common_includes import *
 
 ROLL_SUMMARY = ("Summary of changes available at:\n"
                 "https://chromium.googlesource.com/v8/v8/+log/%s..%s")
 
 ISSUE_MSG = (
 """Please follow these instructions for assigning/CC'ing issues:
 https://github.com/v8/v8/wiki/Triaging%20issues
 
 Please close rolling in case of a roll revert:
 https://v8-roll.appspot.com/
 This only works with a Google account.
 
-CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel""")
+CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel""")
 
 class Preparation(Step):
   MESSAGE = "Preparation."
 
   def RunStep(self):
     self['json_output']['monitoring_state'] = 'preparation'
     # Update v8 remote tracking branches.
     self.GitFetchOrigin()
     self.Git("fetch origin +refs/tags/*:refs/tags/*")
 
@@ skipping 188 matching lines @@
       PrepareRollCandidate,
       SwitchChromium,
       UpdateChromiumCheckout,
       UploadCL,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(AutoRoll().Run())