fix a memory leak and add a suppression

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 # running overnight and removing outdated bugs/suppressions.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 1660 matching lines @@
    fun:WebKit::FrameLoaderClientImpl::finishedLoading
    fun:WebCore::FrameLoader::finishedLoadingDocumen
 }
 {
    bug_114978
    Heapcheck:Leak
    fun:mozilla_security_manager::GenKeyAndSignChallenge
    fun:net::KeygenHandler::GenKeyAndSignChallenge
 }
 {
-   bug_114979_a
+   bug_114979
    Heapcheck:Leak
    ...
    fun:BookmarkBarGtkUnittest::SetUp
 }
 {
-   bug_114979_b
-   Heapcheck:Leak
-   ...
-   fun:BookmarkBarGtkUnittest_HidesHelpMessageWithBookmark_Test::TestBody
-}
-{
    bug_114980
    Heapcheck:Leak
    ...
    fun:BackFwdMenuModelTest_*_Test::TestBody
 }
 {
    bug_114986
    Heapcheck:Leak
    ...
    fun:ThemeServiceFactory::BuildServiceInstanceFor
@@ skipping 166 matching lines @@
    fun:SiteInstanceImpl::GetProcess
    fun:content::RenderViewHostImpl::RenderViewHostImpl
    fun:RenderViewHostFactory::Create
    fun:RenderViewHostManager::Init
    fun:WebContentsImpl::WebContentsImpl
    fun:content::TestWebContents::TestWebContents
    fun:content::WebContentsTester::CreateTestWebContents
    fun:::OneClickSigninHelperTest::CreateMockWebContents
    fun:OneClickSigninHelperTest_*
 }
+{
+  bug_130640_a
+  Heapcheck:Leak
+  ...
+  fun:GtkThemeService::GetFolderIcon
+}
+{
+  bug_130640_b
+  Heapcheck:Leak
+  ...
+  fun:GtkThemeService::GetDefaultFavicon
+}