Fixed memory leak.

tools/heapcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1458 matching lines @@
 }
 {
    bug_143565
    Heapcheck:Leak
    ...
    fun:appcache::AppCacheStorageImpl::Initialize
    fun:appcache::AppCacheService::Initialize
    fun:ChromeAppCacheService::InitializeOnIOThread
 }
 {
-   bug_144898
-   Heapcheck:Leak
-   fun:PrintSystemTaskProxyTest_DetectNoDuplexModeCUPS_Test::TestBody
-}
-{
-   bug_144898_b
-   Heapcheck:Leak
-   fun:PrintSystemTaskProxyTest_DetectDuplexModeCUPS_Test::TestBody
-}
-{
    bug_144913
    Heapcheck:Leak
    ...
    fun:DBusThreadManagerImpl
    fun:chromeos::DBusThreadManager::Initialize
    fun:chromeos::KioskModeIdleLogoutTest::SetUp
 }
 {
    bug_144913_b
    Heapcheck:Leak
@@ skipping 13 matching lines @@
 {
    bug_144913_d
    Heapcheck:Leak
    fun:MessageLoop::MessageLoop
    fun:MessageLoopForUI::MessageLoopForUI
    fun:AshTestBase
    fun:KioskModeIdleLogoutTest
    fun:KioskModeIdleLogoutTest_CheckObserversBeforeUserLogin_Test
    fun:testing::internal::TestFactoryImpl::CreateTest
 }