Backed out changeset b5fbe33b954e (bug 1473786) for browser chrome failures on browser_all_files_referenced.

browser/config/mozconfigs/macosx64/beta

@@ -7,6 +7,4 @@ fi
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
-ac_add_options --enable-lto
-
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/mozconfigs/macosx64/nightly

@@ -9,8 +9,6 @@ if test `uname -s` != Linux; then
   ac_add_options --enable-dtrace
 fi
 
-ac_add_options --enable-lto
-
 ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.common.override"

browser/config/mozconfigs/macosx64/release

@@ -10,8 +10,6 @@ fi
 ac_add_options --enable-official-branding
 ac_add_options --enable-verify-mar
 
-ac_add_options --enable-lto
-
 # safeguard against someone forgetting to re-set EARLY_BETA_OR_EARLIER in
 # defines.sh during the beta cycle
 export BUILDING_RELEASE=1

taskcluster/ci/build/macosx.yml

@@ -49,7 +49,7 @@ macosx64/opt:
         tier: 1
     worker-type: aws-provisioner-v1/gecko-{level}-b-linux
     worker:
-        max-run-time: 7200
+        max-run-time: 3600
         env:
             TOOLTOOL_MANIFEST: "browser/config/tooltool-manifests/macosx64/cross-releng.manifest"
     run: