Eliminate a couple of simple uses of BrowserContent in ash by shifting complexity to ChromeShellDelegate.

[email protected]
http://crbug.com/332504

Review URL: https://codereview.chromium.org/1365413002

Cr-Commit-Position: refs/heads/master@{#351677}
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 735cd0d..359693c 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -185,6 +185,10 @@
   return false;
 }
 
+bool ShellDelegateImpl::CanShowWindowForUser(aura::Window* window) const {
+  return true;
+}
+
 bool ShellDelegateImpl::IsForceMaximizeOnFirstRun() const {
   return false;
 }