Heapchecker: Remove a suppression since the leak has been fixed.

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 # running overnight and removing outdated bugs/suppressions.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 1693 matching lines @@
    bug_103945
    Heapcheck:Leak
    ...
    fun:std::*string::_Rep::_S_create
    ...
    fun:PluginService::RegisterPepperPlugins
    fun:PluginService::Init
    fun:chromeos::::GViewRequestInterceptorTest::SetUp
 }
 {
-   bug_104760
-   Heapcheck:Leak
-   fun:g_malloc
-   fun:g_slice_alloc
-   fun:g_datalist_id_set_data_full
-   fun:g_object_set_data
-   fun:views::NativeWidgetGtk::RegisterChildExposeHandler
-   fun:views::NativeViewHostGtk::NativeViewAttached
-   fun:views::NativeViewHost::Attach
-   fun:NativeTabContentsContainerGtk::AttachContents
-   fun:TabContentsContainer::ChangeTabContents
-   fun:ConstrainedHtmlDelegateGtk
-   fun:ConstrainedHtmlUI::CreateConstrainedHtmlDialog
-   fun:printing::PrintPreviewTabController::CreatePrintPreviewTab
-   fun:printing::PrintPreviewTabController::GetOrCreatePreviewTab
-#   fun:PrintPreviewHandlerTest_StickyMarginsCustomThenDefault_Test::TestBody
-#   fun:PrintPreviewTabControllerUnitTest_GetOrCreatePreviewTab_Test::TestBody
-#   fun:PrintPreviewTabControllerUnitTest_MultiplePreviewTabs_Test::TestBody
-#   fun:PrintPreviewTabControllerUnitTest_ClearInitiatorTabDetails_Test::TestBody
-}
-{
    bug_105624_a
    Heapcheck:Leak
    fun:PeerConnectionHandlerTest_Basic_Test::TestBody
 }
 {
    bug_105624_b
    Heapcheck:Leak
    fun:WTF::fastMalloc
    fun:WTF::RefCounted::operator new
    fun:WebCore::MediaStreamSource::create
@@ skipping 85 matching lines @@
    fun:ProfileInfoCacheTest
 }
 {
    bug_105864_c
    Heapcheck:Leak
    fun:MessageLoop::MessageLoop
    fun:MessageLoopForUI::MessageLoopForUI
    fun:ProfileInfoCacheTest::ProfileInfoCacheTest
 }