Use FrameTreeNode ID as frameId in extension APIs

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
index e2c237946bdd7934164b9fd6d511e729c9c1b90b..46d1020df7444fa09632956f3ec4a6bdae903b70 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
@@ -44,6 +44,7 @@
 #include "content/public/common/resource_type.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
+#include "content/public/test/test_utils.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/switches.h"
 #include "extensions/test/result_catcher.h"
@@ -739,6 +740,12 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcessHistory) {
       << message_;
 }
 
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcessIframe) {
+  content::IsolateAllSitesForTesting(base::CommandLine::ForCurrentProcess());
+  ASSERT_TRUE(StartEmbeddedTestServer());
+  ASSERT_TRUE(RunExtensionTest("webnavigation/crossProcessIframe")) << message_;
+}
+
 // TODO(jam): http://crbug.com/350550
 #if !(defined(OS_CHROMEOS) && defined(ADDRESS_SANITIZER))
 IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, Crash) {