Reland of Update usage of linux blink try bot to use linux_trusty_blink_rel. (patchset #1 id:1 of https://codereview.chromium.org/2507853002/ )

Reason for revert:
linux_trusty_blink_rel is now working, with more capacity

Original issue's description:
> Revert of Update usage of linux blink try bot to use linux_trusty_blink_rel. (patchset #1 id:1 of https://codereview.chromium.org/2475563002/ )
>
> Reason for revert:
> Submitting this before more capacity was added to linux_trusty_blink_rel caused that builder to get too busy (http://crbug.com/665246); should be able to reland after http://crbug.com/665917 is fixed.
>
> Original issue's description:
> > Update usage of linux blink try bot to use linux_trusty_blink_rel.
> >
> > Reason: We're planning to drop support for Linux Precise for layout tests.
> >
> > BUG=chromium:660580
> > NOTRY=true
>
> TBR=machenbach@chromium.org
> # Not skipping CQ checks because original CL landed more than 1 days ago.
> BUG=chromium:660580
> NOTRY=true

TBR=machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:660580

Review-Url: https://codereview.chromium.org/2505403002
Cr-Commit-Position: refs/heads/master@{#41090}