Bug 1557788 - Remove NEED_XVFB from Linux instrumented and rusttest builds; r=firefox-build-system-reviewers,chmanchester

xvfb was used to create a virtual framebuffer for running Firefox during
build jobs to support PGO profile generation. That now runs in a
separate task, so we don't need this flag for builds anymore.

Note that other Linux builds still need xvfb in order to run xpcshell in
'make check'.

Differential Revision: https://phabricator.services.mozilla.com/D56111

--HG--
extra : moz-landing-system : lando

taskcluster/ci/build/linux.yml

@@ -491,7 +491,6 @@ linux-rusttests/opt:
         mozconfig-variant: rusttests
         tooltool-downloads: public
         keep-artifacts: false
-        need-xvfb: true
     run-on-projects: ['trunk', 'try']
     fetches:
         toolchain:
@@ -532,7 +531,6 @@ linux-rusttests/debug:
         mozconfig-variant: rusttests-debug
         tooltool-downloads: public
         keep-artifacts: false
-        need-xvfb: true
     run-on-projects: ['trunk', 'try']
     fetches:
         toolchain:
@@ -1106,7 +1104,6 @@ linux64-rusttests/opt:
         mozconfig-variant: rusttests
         tooltool-downloads: public
         keep-artifacts: false
-        need-xvfb: true
     run-on-projects: ['trunk', 'try']
     fetches:
         toolchain:
@@ -1146,7 +1143,6 @@ linux64-rusttests/debug:
         mozconfig-variant: rusttests-debug
         tooltool-downloads: public
         keep-artifacts: false
-        need-xvfb: true
     run-on-projects: ['trunk', 'try']
     fetches:
         toolchain:

taskcluster/ci/instrumented-build/kind.yml

@@ -48,7 +48,6 @@ jobs:
                 - builds/releng_base_linux_32_builds.py
             mozconfig-variant: profile-generate
             tooltool-downloads: public
-            need-xvfb: true
         fetches:
             toolchain:
                 - linux64-binutils
@@ -74,7 +73,6 @@ jobs:
                 - builds/releng_base_linux_64_builds.py
             mozconfig-variant: profile-generate
             tooltool-downloads: public
-            need-xvfb: true
         fetches:
             toolchain:
                 - linux64-binutils