Annotate LeakyLazyInstance as a leak. Remove HeapChecker suppressions.

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 # running overnight and removing outdated bugs/suppressions.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 277 matching lines @@
    Heapcheck sanity test (ToolsSanityTest.MemoryLeak).
    Heapcheck:Leak
    fun:base::ToolsSanityTest_MemoryLeak_Test::TestBody
 }
 {
    Intentional leak in BrowserThreadTest.NotReleasedIfTargetThreadNonExistent
    Heapcheck:Leak
    fun:content::BrowserThreadTest_NotReleasedIfTargetThreadNonExistent_Test::TestBody
 }
 {
-   Intentional LeakyLazyInstanceTraits leaks
-   Heapcheck:Leak
-   ...
-   fun:base::internal::LeakyLazyInstanceTraits::New
-   fun:base::LazyInstance::Pointer
-}
-{
    Intentional leak in object tracking statics to avoid shutdown race
    Heapcheck:Leak
    ...
    fun:tracked_objects::ThreadData::Initialize*
 }
 {
    Intentional leak in object tracking of thread context to avoid shutdown race
    Heapcheck:Leak
    fun:tracked_objects::ThreadData::Get
 }
 {
    Intentional leak of task birth and death data to avoid shutdown race
    Heapcheck:Leak
    ...
    fun:tracked_objects::ThreadData::TallyA*
 }
 {
-   NSS is initialized (LeakyLazyInstance) but intentionally never shut down
-   Heapcheck:Leak
-   ...
-   fun:InitSessionCacheLocks
-   fun:initSessionCacheLocksLazily
-   ...
-   fun:ssl_InitSessionCacheLocks
-}
-{
    FileStream::Context can leak through WorkerPool by design (Linux)
    Heapcheck:Leak
    fun:net::FileStream::FileStream
 }
 {
    FileStream::Context can leak through WorkerPool by design (CrOS)
    Heapcheck:Leak
    fun:FileStream
 }
 {
@@ skipping 1540 matching lines @@
    fun:extensions::ActivityDatabase::Init
 }
 {
    bug_247525
    Heapcheck:Leak
    ...
    fun:appcache::AppCacheStorageImpl::Initialize
    fun:appcache::AppCacheService::Initialize
    fun:content::ChromeAppCacheService::InitializeOnIOThread
 }