Remove BrowserList::GetLastActive usage from WebUI pages.

chrome/browser/ui/webui/certificate_viewer_webui.cc

Index: chrome/browser/ui/webui/certificate_viewer_webui.cc
===================================================================
--- chrome/browser/ui/webui/certificate_viewer_webui.cc	(revision 142088)
+++ chrome/browser/ui/webui/certificate_viewer_webui.cc	(working copy)
@@ -11,9 +11,7 @@
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/certificate_viewer.h"
-#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
-#include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/certificate_dialogs.h"
 #include "chrome/browser/ui/constrained_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
@@ -22,6 +20,7 @@
 #include "content/public/browser/web_contents.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/gfx/size.h"
 #include "ui/web_dialogs/constrained_web_dialog_ui.h"
 #include "ui/web_dialogs/web_dialog_observer.h"
 
@@ -38,10 +37,11 @@
 }  // namespace
 
 // Shows a certificate using the WebUI certificate viewer.
-void ShowCertificateViewer(gfx::NativeWindow parent,
+void ShowCertificateViewer(WebContents* web_contents,
+                           gfx::NativeWindow parent,
                            net::X509Certificate* cert) {
   CertificateViewerDialog* dialog = new CertificateViewerDialog(cert);
-  dialog->Show(parent);
+  dialog->Show(web_contents, parent);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -68,18 +68,16 @@
 CertificateViewerDialog::~CertificateViewerDialog() {
 }
 
-void CertificateViewerDialog::Show(gfx::NativeWindow parent) {
-  // TODO(oshima): Should get browser from parent.
-  Browser* browser = BrowserList::GetLastActive();
-  DCHECK(browser);
-  TabContents* current_tab_contents = browser->GetActiveTabContents();
+void CertificateViewerDialog::Show(WebContents* web_contents,
+                                   gfx::NativeWindow parent) {
   // TODO(bshe): UI tweaks needed for AURA html Dialog, such as add padding on
   // title for AURA ConstrainedWebDialogUI.
+  TabContents* tab = TabContents::FromWebContents(web_contents);
   window_ = ui::CreateConstrainedWebDialog(
-      current_tab_contents->profile(),
+      tab->profile(),
       this,
       NULL,
-      current_tab_contents)->window()->GetNativeWindow();
+      tab)->window()->GetNativeWindow();
 }
 
 ui::ModalType CertificateViewerDialog::GetDialogModalType() const {