Reenable SitePerProcessBrowserTest.NavigateCrashedSubframeToSameSite.

This was fixed in https://crrev.com/c/2246087 and reenabling got lost
in some rebasing.

Bug: 1064944
Change-Id: I5f1ff9c2135f0861e044590482760708fbe171da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275362Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784279}

content/browser/site_per_process_browsertest.cc

@@ -8353,9 +8353,6 @@ IN_PROC_BROWSER_TEST_P(SitePerProcessBrowserTest,
 // was on before crashing.  See https://crbug.com/634368.
 IN_PROC_BROWSER_TEST_P(SitePerProcessBrowserTest,
                        NavigateCrashedSubframeToSameSite) {
-  // TODO(https://crbug.com/1064944): Enable this when the fix is submitted.
-  if (ShouldCreateNewHostForSameSiteSubframe())
-    return;
   GURL main_url(embedded_test_server()->GetURL(
       "a.com", "/cross_site_iframe_factory.html?a(b)"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));