Reenable test and update expectations

Test expectation updated after landing CL 2245146.

Bug: chromium:1083146, chromium:1107339
Change-Id: Ide9338ee0f34234270b0264c38f0b41274ca6502
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306254Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Philip Pfaffe <pfaffe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790811}

third_party/blink/web_tests/TestExpectations

@@ -6851,9 +6851,6 @@ crbug.com/1101699 external/wpt/webrtc/RTCPeerConnection-setLocalDescription-answ
 crbug.com/1101699 external/wpt/webrtc/RTCPeerConnection-setLocalDescription-pranswer.html [ Pass Failure ]
 crbug.com/1101699 virtual/webrtc-wpt-plan-b/external/wpt/webrtc/RTCPeerConnection-setRemoteDescription-rollback.html [ Pass Failure ]
 
-# Temporarily disable to land a devtools change
-crbug.com/1107339 http/tests/devtools/extensions/extensions-api.js [ Pass Failure ]
-
 # Sheriff 2020-07-07
 # Additionally disabled on mac due to crbug.com/988248
 crbug.com/1083302 media/controls/volumechange-muted-attribute.html [ Pass Failure ]

third_party/blink/web_tests/http/tests/devtools/extensions/extensions-api-expected.txt

@@ -17,6 +17,9 @@ RUNNING TEST: extension_testAPI
         }
         reload : <function>
     }
+    languageServices : {
+        registerLanguageExtensionPlugin : <function>
+    }
     network : {
         addRequestHeaders : <function>
         getHAR : <function>