Backed out 2 changesets (bug 1550611) for breaking test runs on Daily/Nightly-only runs. a=backout

Backed out changeset 6512afbb0b56 (bug 1550611)
Backed out changeset b206f4d87208 (bug 1550611)

taskcluster/ci/build/linux.yml

@@ -60,7 +60,6 @@ linux64-shippable/opt:
             - taskcluster_nightly.py
         script: "mozharness/scripts/fx_desktop_build.py"
         need-xvfb: true
-    run-on-projects: []  # Don't run by default
     toolchains:
         - linux64-binutils
         - linux64-cbindgen
@@ -165,7 +164,6 @@ linux-shippable/opt:
             - taskcluster_nightly.py
         script: "mozharness/scripts/fx_desktop_build.py"
         need-xvfb: true
-    run-on-projects: []  # Don't run by default
     toolchains:
         - linux64-binutils
         - linux64-cbindgen

taskcluster/ci/build/macosx.yml

@@ -65,7 +65,6 @@ macosx64/opt:
             - builds/releng_base_mac_64_cross_builds.py
         script: "mozharness/scripts/fx_desktop_build.py"
         tooltool-downloads: internal
-    run-on-projects: []  # Don't run by default
     toolchains:
         - linux64-binutils
         - linux64-cbindgen

taskcluster/ci/build/windows.yml

@@ -69,7 +69,6 @@ win32-shippable/opt:
             - taskcluster_nightly.py
         extra-config:
             stage_platform: win32
-    run-on-projects: []  # Don't run by default
     toolchains:
         - win64-cbindgen
         - win64-clang-cl
@@ -172,7 +171,6 @@ win64-shippable/opt:
             - taskcluster_nightly.py
         extra-config:
             stage_platform: win64
-    run-on-projects: []  # Don't run by default
     toolchains:
         - win64-cbindgen
         - win64-clang-cl