Update service-worker-v8-cache-expected.txt

After this cl https://chromium-review.googlesource.com/c/v8/v8/+/806741,
printTimelineRecordsWithDetails() outputs the file name of v8-cache-script.js
without the port number and the directory path.

So this test is continuously failing.
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_tests&tests=service-worker-v8-cache

This CL doesn't completely fix the issue.
But I want to update the expectation first to monitor the flakiness dashboard.

Bug: 789111
Change-Id: I936f260c2bc73271cc76f67a99d691415f615103
Reviewed-on: https://chromium-review.googlesource.com/831374
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524653}

third_party/WebKit/LayoutTests/virtual/pwa-full-code-cache/http/tests/devtools/service-workers/service-worker-v8-cache-expected.txt

@@ -28,7 +28,7 @@ v8.compile Properties:
     startTime : <number>
     type : "v8.compile"
 }
-Text details for v8.compile: :8000/devtools/service-workers/resources/v8-cache-script.js:1
+Text details for v8.compile: v8-cache-script.js:1
 -----------------------------------------------
 --- Trace events while executing scripts ------
 v8.compile Properties: