linux_aura: Fix cursor memeory leak, which was redding the lsan bot.

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 37da13a326cb77550cf604e03d19f9f90330be26..12499aa94f4dc29e3d8bf5e4770181b245b8ffa3 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -212,7 +212,8 @@ class FocusManagerEventHandler : public ui::EventHandler {
 
 DesktopNativeCursorManager* DesktopNativeWidgetAura::native_cursor_manager_ =

[tdanderson, 2014/01/14 17:42:27]

|native_cursor_manager_| is OK to leave as a raw pointer here because it is
owned by the |cursor_manager_|. Is that correct?

     NULL;
-views::corewm::CursorManager* DesktopNativeWidgetAura::cursor_manager_ = NULL;
+base::LazyInstance<scoped_ptr<views::corewm::CursorManager> >
+    DesktopNativeWidgetAura::cursor_manager_ = LAZY_INSTANCE_INITIALIZER;
 
 DesktopNativeWidgetAura::DesktopNativeWidgetAura(
     internal::NativeWidgetDelegate* delegate)
@@ -401,12 +402,13 @@ void DesktopNativeWidgetAura::InitNativeWidget(
     native_cursor_manager_ = new DesktopNativeCursorManager(
         DesktopCursorLoaderUpdater::Create());
   }
-  if (!cursor_manager_) {
-    cursor_manager_ = new views::corewm::CursorManager(
-        scoped_ptr<corewm::NativeCursorManager>(native_cursor_manager_));
+  if (!cursor_manager_.Get()) {
+    cursor_manager_.Get().reset(new views::corewm::CursorManager(
+        scoped_ptr<corewm::NativeCursorManager>(native_cursor_manager_)));
   }
   native_cursor_manager_->AddRootWindow(root_window_.get());
-  aura::client::SetCursorClient(root_window_->window(), cursor_manager_);
+  aura::client::SetCursorClient(root_window_->window(),
+                                cursor_manager_.Get().get());
 
   desktop_root_window_host_->OnRootWindowCreated(root_window_.get(), params);