Bypass cross origin prefetch browsertest if split cache is enabled

Cross-origin prefetching is not currently supported when the split
cache is enabled. This breaks the SignedExchangePrefetchBrowserTest/
SignedExchangePrefetchBrowserTest.PrefetchMainResourceSXG_CrossOrigin/0
test. We thus bypass the failing checks if split cache is enabled.

Bug: 1009607
Change-Id: Iede3c1a2f71e3e4472fb5b91724a984898d5b4e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838333Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Commit-Queue: Alex Turner <alexmt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705985}

content/browser/web_package/signed_exchange_subresource_prefetch_browsertest.cc

@@ -286,6 +286,17 @@ class SignedExchangePrefetchBrowserTest
       // Shutdown the server.
       EXPECT_TRUE(embedded_test_server()->ShutdownAndWaitUntilComplete());
 
+      // The HTTP Cache does not currently support cross-origin prefetching if
+      // the split cache is enabled, so skip the rest of the tests.
+      // TODO(crbug.com/939317): Remove this early return when cross-origin
+      // prefetching with split cache works.
+      if (base::FeatureList::IsEnabled(
+              net::features::kSplitCacheByNetworkIsolationKey) &&
+          !url::Origin::Create(sxg_url).IsSameOriginWith(
+              url::Origin::Create(inner_url))) {
+        return;
+      }
+
       // Need to setup MockSignedExchangeHandlerFactory because the SXG is
       // loaded from HTTPCache.
       MockSignedExchangeHandlerFactory factory({MockSignedExchangeHandlerParams(