Fix IsolateIcelandFrameTreeBrowserTest.ProcessSwitchForIsolatedBlob so that it's not flaky under --…

content/browser/frame_host/frame_tree_browsertest.cc

Index: content/browser/frame_host/frame_tree_browsertest.cc
diff --git a/content/browser/frame_host/frame_tree_browsertest.cc b/content/browser/frame_host/frame_tree_browsertest.cc
index 643da7d5293abe1dc52efde3e42f371901d3fe73..bc3078e158c82f8978ebeeb106f2459d5b0b2e01 100644
--- a/content/browser/frame_host/frame_tree_browsertest.cc
+++ b/content/browser/frame_host/frame_tree_browsertest.cc
@@ -732,7 +732,7 @@ IN_PROC_BROWSER_TEST_F(IsolateIcelandFrameTreeBrowserTest,
   FrameTreeNode* root =
       static_cast<WebContentsImpl*>(contents)->GetFrameTree()->root();
   GURL main_url(embedded_test_server()->GetURL(
-      "a.com", "/cross_site_iframe_factory.html?a(b)"));
+      "a.com", "/cross_site_iframe_factory.html?a(a)"));
   EXPECT_TRUE(NavigateToURL(shell(), main_url));
 
   // The navigation targets an invalid blob url; that's intentional to trigger