Add heapcheck suppressionfor BackgrounApplicationListModelTest.LoadExplicitExtensions

BUG=73558
TEST=None

Review URL: http://codereview.chromium.org/6538040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75348 0039d316-1c4b-4281-b951-d872f2087c98

tools/heapcheck/suppressions.txt

@@ -1260,3 +1260,12 @@
    ...
    fun:ExtensionSpecialStoragePolicyTest_*
 }
+{
+   bug_73358
+   Heapcheck:Leak
+   fun:TestingProfile::GetRequestContextForExtensions
+   fun:ExtensionDataDeleter
+   fun:ExtensionService::ClearExtensionData
+   fun:ExtensionService::UninstallExtension
+   fun:BackgroundApplicationListModelTest_LoadExplicitExtensions_Test::TestBody
+}