aura: Require explicit ownership of the Env instance.

chrome/test/base/view_event_test_platform_part_ash.cc

Index: chrome/test/base/view_event_test_platform_part_ash.cc
diff --git a/chrome/test/base/view_event_test_platform_part_ash.cc b/chrome/test/base/view_event_test_platform_part_ash.cc
index 89f3c94c9a55aecf892c1aeeae5599eb55edc077..7ea2da1110a79691d0a9a8c3c53b3576b430559a 100644
--- a/chrome/test/base/view_event_test_platform_part_ash.cc
+++ b/chrome/test/base/view_event_test_platform_part_ash.cc
@@ -27,6 +27,7 @@ class ViewEventTestPlatformPartAsh : public ViewEventTestPlatformPart {
  private:
   scoped_ptr<gfx::Screen> screen_;
   wm::WMState wm_state_;
+  scoped_ptr<aura::Env> env_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewEventTestPlatformPartAsh);
 };
@@ -37,12 +38,12 @@ ViewEventTestPlatformPartAsh::ViewEventTestPlatformPartAsh(
   // http://crbug.com/154081 use ash::Shell code path below on win_ash bots when
   // interactive_ui_tests is brought up on that platform.
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_.get());
-  aura::Env::CreateInstance(true);
+  env_ = aura::Env::CreateInstance();
   aura::Env::GetInstance()->set_context_factory(context_factory);
 }
 
 ViewEventTestPlatformPartAsh::~ViewEventTestPlatformPartAsh() {
-  aura::Env::DeleteInstance();
+  env_.reset();
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, nullptr);
 }