Convert print_dialog_cloud::SignInObserver to use the new navigation callbacks.

chrome/browser/printing/print_dialog_cloud.cc

Index: chrome/browser/printing/print_dialog_cloud.cc
diff --git a/chrome/browser/printing/print_dialog_cloud.cc b/chrome/browser/printing/print_dialog_cloud.cc
index 2491feff0b126c098a46b9507e09b99c66fd1be4..8fb8f9df5f0e45dcbc57de5d3f6d220ff318cff0 100644
--- a/chrome/browser/printing/print_dialog_cloud.cc
+++ b/chrome/browser/printing/print_dialog_cloud.cc
@@ -17,6 +17,7 @@
 #include "components/signin/core/browser/signin_metrics.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 
@@ -35,10 +36,14 @@ class SignInObserver : public content::WebContentsObserver {
 
  private:
   // Overridden from content::WebContentsObserver:
-  void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) override {
-    if (cloud_devices::IsCloudPrintURL(params.url)) {
+  void DidFinishNavigation(
+      content::NavigationHandle* navigation_handle) override {
+    if (!navigation_handle->IsInMainFrame() ||
+        !navigation_handle->HasCommitted()) {
+      return;
+    }
+
+    if (cloud_devices::IsCloudPrintURL(navigation_handle->GetURL())) {
       base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE, base::Bind(&SignInObserver::OnSignIn,
                                 weak_ptr_factory_.GetWeakPtr()));