Fix leaks in aura_unittests

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 # running overnight and removing outdated bugs/suppressions.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 159 matching lines @@
    fun:_IO_getdelim
 }
 {
    bug_119677
    Heapcheck:Leak
    ...
    fun:DisplayChangeObserverX11
    fun:aura::Env::Init
    fun:aura::Env::GetInstance
 }
+{
+   bug_146464_a
+   Heapcheck:Leak
+   fun:get_peer_sock_name
+   fun:base::MessagePumpAuraX11::GetDefaultXDisplay
+}
+{
+   bug_146464_b
+   Heapcheck:Leak
+   fun:add_codeset.isra.10
+   ...
+   fun:RootWindowHostLinux
+   fun:aura::RootWindowHost::Create
+}
+{
+   bug_146464_c
+   Heapcheck:Leak
+   fun:??
+   ...
+   fun:RootWindowHostLinux
+   fun:aura::RootWindowHost::Create
+}
 
 #-----------------------------------------------------------------------
 # 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
 {
    Heapcheck sanity test (ToolsSanityTest.MemoryLeak).
    Heapcheck:Leak
    fun:base::ToolsSanityTest_MemoryLeak_Test::TestBody
 }
 {
@@ skipping 1319 matching lines @@
    fun:KioskModeIdleLogoutTest
    fun:KioskModeIdleLogoutTest_CheckObserversBeforeUserLogin_Test
    fun:testing::internal::TestFactoryImpl::CreateTest
 }
 {
    bug_146222
    Heapcheck:Leak
    ...
    fun:content::TestHyphenatorMessageFilter::OnOpenDictionary
 }
+{
+   bug_146465_a
+   Heapcheck:Leak
+   fun:ui::GestureSequence::ProcessTouchEventForGesture
+   fun:ui::GestureRecognizerImpl::AdvanceTouchQueueByOne
+   fun:ui::GestureRecognizerImpl::AdvanceTouchQueue
+   fun:aura::RootWindow::AdvanceQueuedTouchEvent
+}
+{
+   bug_146465_b
+   Heapcheck:Leak
+   ...
+   fun:ui::GestureSequence::ProcessTouchEventForGesture
+   fun:ui::GestureRecognizerImpl::AdvanceTouchQueueByOne
+   fun:ui::GestureRecognizerImpl::AdvanceTouchQueue
+   fun:aura::RootWindow::AdvanceQueuedTouchEvent
+}