[Sheriff] Disable ExtensionFetchTest.ExtensionCannotFetchHostedResourceWithoutHostPermissions

Test is flaky.

https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests/85451

Bug: 1038156
Change-Id: Ice9b10b2acaedcba0ecf3463475d94962af27514
NoTry: True
Tbr: lazyboy@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982936Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727658}

chrome/browser/extensions/fetch_apitest.cc

@@ -154,9 +154,10 @@ IN_PROC_BROWSER_TEST_F(ExtensionFetchTest,
                               "example.com", "/extensions/test_file.txt"))));
 }
 
+// TODO(crbug.com/1038156): Test is flaky.
 IN_PROC_BROWSER_TEST_F(
     ExtensionFetchTest,
-    ExtensionCannotFetchHostedResourceWithoutHostPermissions) {
+    DISABLED_ExtensionCannotFetchHostedResourceWithoutHostPermissions) {
   TestExtensionDir dir;
   constexpr char kManifest[] =
       R"({