Autofill: unit test / valgrind; gyp tweak

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 # running overnight and removing outdated bugs/suppressions.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 1614 matching lines @@
 {
    bug_100608
    Heapcheck:Leak
    ...
    fun:SQLitePersistentCookieStore::Backend::LoadCookiesForDomains
    ...
    fun:base::internal::Invoker*::DoInvoke
    fun:base::Callback::Run
    fun:MessageLoop::RunTask
 }
-{
-   bug_102256
-   Heapcheck:Leak
-   ...
-   fun:AutocompleteHistoryManager::SendSuggestions
-   fun:AutocompleteHistoryManagerTest_ExternalDelegate_Test::TestBody
-}