Widen leak suppression for Extension::Create() to cover rb_tree nodes in Manifest.

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 # running overnight and removing outdated bugs/suppressions.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 1768 matching lines @@
    fun:views::FocusManagerFactory::Create
    fun:views::Widget::OnNativeWidgetCreated
    fun:views::NativeWidgetGtk::InitNativeWidget
    fun:views::Widget::Init
    fun:views::Widget::CreateWindowWithParentAndBounds
    fun:views::Widget::CreateWindowWithBounds
    fun:AccessibilityEventRouterViewsTest::CreateWindowWithContents
    fun:AccessibilityEventRouterViewsTest_TestFocusNotification_Test::TestBody
 }
 {
-   bug_106331
+   bug_106331_a
    Heapcheck:Leak
    ...
    fun:Extension::Create
 }
+{
+   bug_106331_b
+   Heapcheck:Leak
+   ...
+   fun:ExtensionUnpacker::ReadManifest
+   fun:ExtensionUnpacker::Run
+}
+{
+   bug_106331_c
+   Heapcheck:Leak
+   ...
+   fun:JSONFileValueSerializer::Deserialize
+   fun:::FileThreadDeserializer::DoReading
+   fun:JsonPrefStore::ReadPrefs
+   fun:PrefService::InitFromStorage
+   fun:PrefService*
+   fun:PrefServiceMockBuilder::Create
+   fun:ExtensionServiceTestBase::InitializeExtensionService
+   fun:ExtensionServiceTestBase::InitializeInstalledExtensionService
+   fun:ExtensionServiceTest_UninstallingNotLoadedExtension_Test::TestBody
+}