[HTerm-Crosh] Add key shortcut for opening Crosh on ChromeOS Aura.

ash/shell/shell_main.cc

Index: ash/shell/shell_main.cc
diff --git a/ash/shell/shell_main.cc b/ash/shell/shell_main.cc
index 93029909995e58ede9cc7028bd47dde6a0071fea..1f76d051fd70271ea7346caffddebeb69e532bd1 100644
--- a/ash/shell/shell_main.cc
+++ b/ash/shell/shell_main.cc
@@ -30,6 +30,8 @@
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
+class GURL;
+
 namespace {
 
 class ShellViewsDelegate : public views::TestViewsDelegate {
@@ -155,6 +157,9 @@ class ShellDelegateImpl : public ash::ShellDelegate {
     return windows;
   }
 
+  virtual void OpenNewTab(const GURL& url) OVERRIDE {
+  }
+
   virtual void LauncherItemClicked(
       const ash::LauncherItem& item) OVERRIDE {
     aura::Window* window = watcher_->GetWindowByID(item.id);