Better ActivityLog error handling

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 # running overnight and removing outdated bugs/suppressions.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 1823 matching lines @@
 }
 {
    bug_246567c
    Heapcheck:Leak
    fun:v8::internal::PerThreadAssertScopeBase::AssertData
    fun:v8::internal::PerThreadAssertScope::IsAllowed
    fun:v8::internal::HandleScope::CreateHandle
    fun:Handle
 }
 {
-   bug_246825a
-   Heapcheck:Leak
-   ...
-   fun:sql::Connection::GetCachedStatement
-   ...
-   fun:extensions::ActivityDatabase::Init
-}
-{
-   bug_246825b
-   Heapcheck:Leak
-   fun:__gnu_cxx::new_allocator::allocate
-   fun:std::_Vector_base::_M_allocate
-   fun:std::vector::_M_insert_aux
-   fun:std::vector::push_back
-   fun:extensions::ActivityDatabase::RecordAction
-}
-{
-   bug_246825c
-   Heapcheck:Leak
-   fun:base::Bind
-   fun:base::BaseTimerMethodPointer::Start
-   fun:extensions::ActivityDatabase::Init
-}
-{
-   bug_246825d
-   Heapcheck:Leak
-   ...
-   fun:LogExtensionActivity
-   fun:ExtensionWebRequestEventRouter::DecrementBlockCount
-   fun:ExtensionWebRequestEventRouter::OnEventHandled
-   fun:EventHandledOnIOThread
-}
-{
-   bug_246825e
-   Heapcheck:Leak
-   fun:sqlite3MemMalloc
-   ...
-   fun:extensions::ActivityDatabase::Init
-}
-{
    bug_247525
    Heapcheck:Leak
    ...
    fun:appcache::AppCacheStorageImpl::Initialize
    fun:appcache::AppCacheService::Initialize
    fun:content::ChromeAppCacheService::InitializeOnIOThread
 }