Fix some memory leaks.

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 # running overnight and removing outdated bugs/suppressions.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 1382 matching lines @@
    fun:std::string::append
    fun:FilePath::Append
    fun:ProfileManagerTest_CreateProfileAsyncMultipleRequests_Test::TestBody
 }
 {
    bug_91174
    Heapcheck:Leak
    fun:DownloadManager::OnPathExistenceAvailable
 }
 {
-   bug_112795
-   Heapcheck:Leak
-   fun:XGetAtomName
-   fun:ui::TouchFactory::UpdateDeviceList
-   fun:TouchFactory
-   fun:DefaultSingletonTraits::New
-   fun:Singleton::get
-   fun:ui::TouchFactory::GetInstance
-}
-{
    bug_112798_a
    Heapcheck:Leak
    ...
    fun:RenderWidgetHostViewAura::InitAsChild
    fun:RenderWidgetHostTest_Background_Test::TestBody
 }
 {
    bug_112798_b
    Heapcheck:Leak
    ...
    fun:RenderWidgetHostViewAura
    fun:RenderWidgetHostView::CreateViewForWidget
 }
 {
    bug_112798_c
    Heapcheck:Leak
    ...
    fun:RenderWidgetHostViewAura::InitAsFullscreen
    fun:RenderWidgetHostViewAuraTest_Fullscreen_Test::TestBody
 }
 {
    bug_112798_d
    Heapcheck:Leak
    ...
    fun:RenderWidgetHostViewAuraTest::TearDown
 }
-{
-   bug_112803
-   Heapcheck:Leak
-   ...
-   fun:views::ViewLayerTest_OrphanLayerAfterViewRemove_Test::TestBody
-}
 
 # These are temporary suppressions for the CrOS bot to be used until the stacks are fixed.
 {
    bug_90013_a
    Heapcheck:Leak
    ...
    fun:gtk_views_fixed_new
 }
 {
    bug_90013_b
@@ skipping 369 matching lines @@
    fun:v8::internal::NativeObjectsExplorer::IterateAndExtractReferences
    fun:v8::internal::HeapSnapshotGenerator::CountEntriesAndReferences
    fun:v8::internal::HeapSnapshotGenerator::GenerateSnapshot
    fun:v8::internal::HeapProfiler::TakeSnapshotImpl
    fun:v8::internal::HeapProfiler::TakeSnapshotImpl
    fun:v8::internal::HeapProfiler::TakeSnapshot
    fun:v8::HeapProfiler::TakeSnapshot
    fun:GetNumObjects
    ...
 }
-