Update Heapcheck suppressions after r78856.

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 # running overnight and removing outdated bugs/suppressions.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 1192 matching lines @@
 }
 {
    bug_75120
    Heapcheck:Leak
    fun:remoting::ChromotingHostTest::SetUp
 }
 {
    bug_75224
    Heapcheck:Leak
    fun:AutofillDownloadTestHelper
-   fun:AutoFillDownloadTest_*Test_Test::TestBody
+   fun:AutofillDownloadTest_*Test_Test::TestBody
 }
 {
    bug_75917
    Heapcheck:Leak
    fun:FilePathWatcher
    fun:PluginService
    fun:DefaultSingletonTraits::New
    fun:Singleton::get
    fun:PluginService::GetInstance
    fun:::PluginServiceTest::SetUp
@@ skipping 10 matching lines @@
    bug_76644_a
    Heapcheck:Leak
    ...
    fun:UserStyleSheetWatcherTest_StyleLoad_Test::TestBody
 }
 {
    bug_76644_b
    Heapcheck:Leak
    fun:UserStyleSheetWatcher::Init
 }