Remove unused 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 # running overnight and removing outdated bugs/suppressions.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 392 matching lines @@
   fun:RunnableMethod::Run
 }
 {
    bug_34570
    Heapcheck:Leak
    fun:URLRequestHttpJob::Factory
    fun:URLRequestJobManager::CreateJob
    fun:net::URLRequest::Start
    fun:URLRequestTest_CancelTest_DuringCookiePolicy_Test::TestBody
 }
-{
-   bug_34994_a
-   Heapcheck:Leak
-   ...
-   fun:v8::internal::Invoke
-   fun:v8::internal::Execution::Call
-   fun:v8::Script::Run
-}
-{
-   bug_34994_b
-   Heapcheck:Leak
-   ...
-   fun:v8::internal::Invoke
-   fun:v8::internal::Execution::Call
-   fun:v8::Function::Call
-}
 # TODO(glider): sometimes the stacks differ between the bot and the local run,
 # e.g. "base::subtle::RefCountedBase::RefCountedBase" vs. "RefCountedBase".
 {
   bug_38305
   Heapcheck:Leak
   fun:browser_sync::UIModelWorker::DoWorkAndWaitUntilDone
   fun:Syncer::SyncShare
   fun:FakeSyncShareTask::Run
   fun:MessageLoop::RunTask
 }
@@ skipping 1183 matching lines @@
    bug_166989
    Heapcheck:Leak
    ...
    fun:ui::CreateInvisibleCursor
    ...
    fun:ui::CursorLoader::Create
    fun:ash::ImageCursors::SetDeviceScaleFactor
    fun:ash::CursorManager::SetDeviceScaleFactor
    fun:ash::Shell::Init
 }