Delete the controllers when ScreenManager is deleted

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/344443009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278100 0039d316-1c4b-4281-b951-d872f2087c98

ui/ozone/platform/dri/screen_manager.cc

@@ -21,6 +21,8 @@ ScreenManager::ScreenManager(
 }
 
 ScreenManager::~ScreenManager() {
+  STLDeleteContainerPairSecondPointers(
+      controllers_.begin(), controllers_.end());
 }
 
 void ScreenManager::RemoveDisplayController(uint32_t crtc, uint32_t connector) {