Bug 1451849 - Enable e10s mode on linux64-jsdcov. r=jmaher

This patch enables e10s mode on all suites running on the linux64-jsdcov code coverage build.

MozReview-Commit-ID: Iex6VPhLVpJ

--HG--
extra : rebase_source : 3c9124304e33856465aacdafb3e4abf4e7ac64e9

taskcluster/ci/test/mochitest.yml

@@ -49,7 +49,6 @@ mochitest:
             default: 5
     e10s:
         by-test-platform:
-            linux64-jsdcov/opt: false
             linux32/debug: both
             default: true
     max-run-time:
@@ -103,10 +102,6 @@ mochitest-browser-chrome:
             linux.*/debug: 16
             linux64-asan/opt: 16
             default: 7
-    e10s:
-        by-test-platform:
-            linux64-jsdcov/opt: false
-            default: true
     max-run-time:
         by-test-platform:
             linux64-.*cov/opt: 7200
@@ -243,10 +238,6 @@ mochitest-devtools-chrome:
         by-test-platform:
             windows10-64-ccov/debug: 10
             default: 8
-    e10s:
-        by-test-platform:
-            linux64-jsdcov/opt: false
-            default: true
     mozharness:
         mochitest-flavor: chrome
         chunked: true

taskcluster/ci/test/reftest.yml

@@ -73,10 +73,6 @@ jsreftest:
             linux32/debug: 5
             macosx.*: 2
             default: 3
-    e10s:
-        by-test-platform:
-            linux64-jsdcov/opt: false
-            default: true
     max-run-time:
         by-test-platform:
             android.*: 7200
@@ -169,10 +165,6 @@ reftest-no-accel:
             macosx.*: 1
             windows.*: 4
             default: 8
-    e10s:
-        by-test-platform:
-            linux64-jsdcov/opt: false
-            default: true
     mozharness:
         chunked:
             by-test-platform: