Re-enable devtools layout tests that were disabled.

The changes were landed in the devtools repo but the tests were not
re-enabled.

BUG=1030746

Change-Id: If7d5184ae6bb1a21ce6241d1391e0b0c981b96e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2120742Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753257}

third_party/blink/web_tests/TestExpectations

@@ -6267,10 +6267,6 @@ crbug.com/836300 fast/css3-text/css3-text-decoration/text-decoration-skip-ink-li
 crbug.com/1041973 external/wpt/html/semantics/forms/constraints/form-validation-reportValidity.html [ Pass Failure ]
 crbug.com/1041973 virtual/web-components-v0-disabled/external/wpt/html/semantics/forms/constraints/form-validation-reportValidity.html [ Pass Failure ]
 
-# Disabled for landing devtools changes
-crbug.com/1030746 http/tests/devtools/sources/debugger-ui/sourcemap-src-not-loaded.js [ Pass Failure ]
-crbug.com/1030746 http/tests/devtools/network/load-resource-for-frontend.js [ Pass Failure ]
-
 # Disable for landing devtools changes
 crbug.com/1006759 http/tests/devtools/console/argument-hints.js [ Pass Failure ]
 

third_party/blink/web_tests/http/tests/devtools/network/load-resource-for-frontend-expected.txt

@@ -3,31 +3,31 @@ Test loading resource for frontend.
 
 Running: testNetworkResourceNonCached
 Loading resource from http://localhost:8080/devtools/network/resources/resource.php
-Success: 200
+Success: true
 Logged headers: cache-control, expires, pragma
 Content: "Hello world"
 
 Running: testNetworkResourceCached
 Loading resource from http://localhost:8080/devtools/network/resources/resource.php?cached=1
-Success: 200
+Success: true
 Logged headers: cache-control, expires, last-modified
 Content: "Hello world"
 
 Running: testNetworkResourceIfModifiedSince
 Loading resource from http://localhost:8080/devtools/network/resources/resource.php?cached=1
-Success: 304
+Success: false
 Logged headers: 
 Content: ""
 
 Running: testResourceFromIncorrectURL
 Loading resource from resource.php
-Success: 404
+Success: false
 Logged headers: 
 Content: ""
 
 Running: testResourceWithCookie
 Loading resource from http://127.0.0.1:8000/devtools/network/resources/print-cookie.php
-Success: 200
+Success: true
 Logged headers: cache-control, expires, pragma
 Content: "Cookie value: TestCookieValue."
 

third_party/blink/web_tests/http/tests/devtools/sources/debugger-ui/sourcemap-src-not-loaded-expected.txt

 Tests that an error loading a source-map-referred file will display an error message in the source panel.
 
-error: Could not load content for http://127.0.0.1:8000/devtools/sources/debugger-ui/resources/sourcemap-src-not-loaded.ts (HTTP status code: 404, net error code 0)
+error: Could not load content for http://127.0.0.1:8000/devtools/sources/debugger-ui/resources/sourcemap-src-not-loaded.ts (HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE)
 JavaScript source file:
 var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
@@ -32,5 +32,5 @@ assert(2 + 2 === 4, 'The laws of mathematics have been violated.');
 TypeScript source file:
 undefined
 TypeScript resolution error:
-Could not load content for http://127.0.0.1:8000/devtools/sources/debugger-ui/resources/sourcemap-src-not-loaded.ts (HTTP status code: 404, net error code 0)
+Could not load content for http://127.0.0.1:8000/devtools/sources/debugger-ui/resources/sourcemap-src-not-loaded.ts (HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE)