Fixes the crash for "learn more" link of the dialog for v2 apps.

chrome/browser/chromeos/attestation/platform_verification_dialog.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/attestation/platform_verification_dialog.h"
 
 #include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/common/url_constants.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/page_transition_types.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
 #include "grit/generated_resources.h"
 #include "ui/aura/window.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/styled_label.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/layout/layout_constants.h"
 #include "ui/views/widget/widget.h"
@@ skipping 13 matching lines @@
     const PlatformVerificationFlow::Delegate::ConsentCallback& callback) {
   GURL url = web_contents->GetLastCommittedURL();
   // In the case of an extension or hosted app, the origin of the request is
   // best described by the extension / app name.
   const extensions::Extension* extension =
       extensions::ExtensionRegistry::Get(web_contents->GetBrowserContext())->
           enabled_extensions().GetExtensionOrAppByURL(url);
   std::string origin = extension ? extension->name() : url.GetOrigin().spec();
 
   PlatformVerificationDialog* dialog = new PlatformVerificationDialog(
-      chrome::FindBrowserWithWebContents(web_contents),
+      web_contents,
       base::UTF8ToUTF16(origin),
       callback);
 
   // Sets up the dialog widget and shows it.
   web_modal::WebContentsModalDialogManager* web_contents_modal_dialog_manager =
       web_modal::WebContentsModalDialogManager::FromWebContents(web_contents);
   web_modal::WebContentsModalDialogManagerDelegate* modal_delegate =
       web_contents_modal_dialog_manager->delegate();
   views::Widget* widget = views::Widget::CreateWindowAsFramelessChild(
       dialog, modal_delegate->GetWebContentsModalDialogHost()->GetHostView());
   web_contents_modal_dialog_manager->ShowModalDialog(
       widget->GetNativeView());
   widget->Show();
 }
 
 PlatformVerificationDialog::~PlatformVerificationDialog() {
 }
 
 PlatformVerificationDialog::PlatformVerificationDialog(
-    Browser* browser,
+    content::WebContents* web_contents,
     const base::string16& domain,
     const PlatformVerificationFlow::Delegate::ConsentCallback& callback)
-    : browser_(browser),
+    : web_contents_(web_contents),
       domain_(domain),
       callback_(callback) {
   SetLayoutManager(new views::FillLayout());
   SetBorder(views::Border::CreateEmptyBorder(
       0, views::kButtonHEdgeMarginNew, 0, views::kButtonHEdgeMarginNew));
   const base::string16 learn_more = l10n_util::GetStringUTF16(IDS_LEARN_MORE);
   std::vector<size_t> offsets;
   base::string16 headline = l10n_util::GetStringFUTF16(
       IDS_PLATFORM_VERIFICATION_DIALOG_HEADLINE, domain_, learn_more, &offsets);
   views::StyledLabel* headline_label = new views::StyledLabel(headline, this);
@@ skipping 38 matching lines @@
   return ui::MODAL_TYPE_CHILD;
 }
 
 gfx::Size PlatformVerificationDialog::GetPreferredSize() {
   return gfx::Size(kDialogMaxWidthInPixel,
                    GetHeightForWidth(kDialogMaxWidthInPixel));
 }
 
 void PlatformVerificationDialog::StyledLabelLinkClicked(const gfx::Range& range,
                                                         int event_flags) {
-  chrome::ShowSingletonTab(browser_, GURL(
-      chrome::kEnhancedPlaybackNotificationLearnMoreURL));
+  Browser* browser = chrome::FindBrowserWithWebContents(web_contents_);
+  const GURL learn_more_url(chrome::kEnhancedPlaybackNotificationLearnMoreURL);
+
+  // |web_contents_| might not be in a browser in case of v2 apps. In that case,
+  // open a new tab in the usual way.
+  if (!browser) {
+    Profile* profile = Profile::FromBrowserContext(
+        web_contents_->GetBrowserContext());
+    chrome::NavigateParams params(
+        profile, learn_more_url, content::PAGE_TRANSITION_LINK);
+    params.disposition = SINGLETON_TAB;
+    chrome::Navigate(&params);
+  } else {
+    chrome::ShowSingletonTab(browser, learn_more_url);
+  }
 }
 
 }  // namespace attestation
 }  // namespace chromeos