[devtools] Remove temporary code from web test

After the TypeScript-ification CL has landed, the temporary sniffer
code can now be removed.

TBR=tvanderlippe@chromium.org

Bug: chromium:1011811
Change-Id: I06092252604756a132b016701e653b574c34d571
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2395615Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804706}

third_party/blink/web_tests/http/tests/devtools/runtime/runtime-setPropertyValue.js

@@ -96,12 +96,6 @@
 
     function testReleaseObjectIsCalled(next) {
       // If failed, this test will time out.
-      TestRunner.addSniffer(TestRunner.RuntimeAgent, 'releaseObject', async () => {
-        await ConsoleTestRunner.dumpConsoleMessages();
-        next();
-      });
-      // Temporarily install sniffer on both methods until TS migration for RemoteObject.js is done.
-      // TODO(crbug.com/1011811): Remove once RemoteObject.js is TypeScript-ified.
       TestRunner.addSniffer(TestRunner.RuntimeAgent, 'invoke_releaseObject', async () => {
         await ConsoleTestRunner.dumpConsoleMessages();
         next();