[DevTools] Rebaseline test expectation after https://crrev.com/c/3099011

There's still one test skipped because it requires more work.

Bug: chromium:1199701, chromium:1249961
Change-Id: I21edcf62f02e2feb8d1628fff4a01be411738610
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3162086
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#922100}
diff --git a/third_party/blink/web_tests/TestExpectations b/third_party/blink/web_tests/TestExpectations
index bee9d4a..9b5ddc5 100644
--- a/third_party/blink/web_tests/TestExpectations
+++ b/third_party/blink/web_tests/TestExpectations
@@ -6408,7 +6408,6 @@
 
 # Temporarily disabled to unblock https://crrev.com/c/3099011
 crbug.com/1199701 http/tests/devtools/console/console-big-array.js [ Skip ]
-crbug.com/1199701 http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion.js [ Skip ]
 
 # Sheriff 2021-5-19
 # Flaky on Webkit Linux Leak
diff --git a/third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion-expected.txt b/third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion-expected.txt
index 6362dbf23..65264bd 100644
--- a/third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion-expected.txt
+++ b/third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion-expected.txt
@@ -120,6 +120,7 @@
       298: 298
       299: 299
     length: 300
+    [[Prototype]]: Array(0)
 func: function() {return a + b;}
     arguments: null
     caller: null
@@ -247,6 +248,7 @@
       298: 298
       299: 299
     length: 300
+    [[Prototype]]: Array(0)
 func: function() {return a + b;}
     arguments: null
     caller: null