Fix Manifest leak in Extension::InitFromValue.

tools/heapcheck/suppressions.txt

Index: tools/heapcheck/suppressions.txt
diff --git a/tools/heapcheck/suppressions.txt b/tools/heapcheck/suppressions.txt
index dc9617436e91c72a82cc80140a00a3bbb6e978ef..fa903814c5596ac595ff7cfca9de405a9e486c79 100644
--- a/tools/heapcheck/suppressions.txt
+++ b/tools/heapcheck/suppressions.txt
@@ -1785,30 +1785,3 @@
    fun:AccessibilityEventRouterViewsTest::CreateWindowWithContents
    fun:AccessibilityEventRouterViewsTest_TestFocusNotification_Test::TestBody
 }
-{
-   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
-}