Suppress a lot of reports on the Memory FYI waterfall

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 # running overnight and removing outdated bugs/suppressions.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 118 matching lines @@
 # 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
 {
    Heapcheck sanity test (ToolsSanityTest.MemoryLeak).
    Heapcheck:Leak
    fun:base::ToolsSanityTest_MemoryLeak_Test::TestBody
 }
 {
    Intentional leak in BrowserThreadTest.NotReleasedIfTargetThreadNonExistent
    Heapcheck:Leak
-   fun:BrowserThreadTest_NotReleasedIfTargetThreadNonExistent_Test::TestBody
+   fun:content::BrowserThreadTest_NotReleasedIfTargetThreadNonExistent_Test::TestBody
 }
 {
    Intentional leak of *Histograms to avoid shutdown races
    Heapcheck:Leak
    ...
    fun:base::*Histogram::FactoryGet
 }
 {
    Intentional leak of stats histogram to avoid shutdown races
    Heapcheck:Leak
@@ skipping 1473 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
+}