Adds views::corewm::WMState to install common state

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 b45ca5e9da3f9eddf4205fe798fa527b2afb4be2..3c477a415bedf041b4163b291b9bc0d542d09734 100644
--- a/ash/shell/shell_main.cc
+++ b/ash/shell/shell_main.cc
@@ -5,34 +5,21 @@
 #include "ash/shell/content_client/shell_main_delegate.h"
 #include "content/public/app/content_main.h"
 #include "sandbox/win/src/sandbox_types.h"
-#include "ui/views/corewm/transient_window_stacking_client.h"
 
 #if defined(OS_WIN)
 #include "content/public/app/startup_helper_win.h"
 #endif
 
-namespace {
-
-void CommonInit() {
-  // SetWindowStackingClient() takes ownership of TransientWindowStackingClient.
-  aura::client::SetWindowStackingClient(
-      new views::corewm::TransientWindowStackingClient);
-}
-
-}  // namespace
-
 #if defined(OS_WIN)
 int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE, wchar_t*, int) {
   sandbox::SandboxInterfaceInfo sandbox_info = {0};
   content::InitializeSandboxInfo(&sandbox_info);
   ash::shell::ShellMainDelegate delegate;
-  CommonInit();
   return content::ContentMain(instance, &sandbox_info, &delegate);
 }
 #else
 int main(int argc, const char** argv) {
   ash::shell::ShellMainDelegate delegate;
-  CommonInit();
   return content::ContentMain(argc, argv, &delegate);
 }
 #endif