Add case-sensitive tests to DRT ignore list.

/mnt/sdcard forces lowercase, but these tests verify
the capitialization of the filename. We will never pass them
with DRT1 while storing tests on external storage. DRT2 will
fix this as it does not store any files locally (hence DRT2's
ignore list is unchanged).

Change-Id: Ia062ad77ad312a34db61d606a1d1382ac1d7b70e

tests/DumpRenderTree/src/com/android/dumprendertree/FileFilter.java

@@ -122,6 +122,8 @@ public class FileFilter {
         ignoreResultList.add("storage/indexeddb"); // indexeddb not supported
         ignoreResultList.add("storage/private-browsing-readonly.html"); // private browsing not supported
         ignoreResultList.add("websocket/tests/workers"); // workers not supported
+        ignoreResultList.add("dom/xhtml/level2/html/htmldocument04.xhtml"); // /mnt/sdcard on SR uses lowercase filesystem, this test checks filename and is case senstive.
+        ignoreResultList.add("dom/html/level2/html/htmldocument04.html"); // ditto
 
         // Expected failures due to missing expected results
         ignoreResultList.add("dom/xhtml/level3/core/canonicalform08.xhtml");