Bug 1250341 - simplify overcomplex browser-element mochitest manifest skip-if rules; r=fabrice

dom/browser-element/mochitest/mochitest.ini

@@ -166,7 +166,7 @@ tags = audiochannel
 skip-if = buildapp == 'b2g'
 [test_browserElement_inproc_AlertInFrame.html]
 [test_browserElement_inproc_AppFramePermission.html]
-skip-if = toolkit == 'android' || buildapp != 'mulet'
+skip-if = buildapp != 'mulet'
 [test_browserElement_inproc_AppWindowNamespace.html]
 skip-if = toolkit == 'android' || buildapp == 'b2g' # android(TIMED_OUT, bug 783509) androidx86(TIMED_OUT, bug 783509)
 [test_browserElement_inproc_AudioChannelMutedByDefault.html]
@@ -192,7 +192,7 @@ skip-if = (os == "android") # Disabled on Android, see bug 1230421
 [test_browserElement_inproc_DOMRequestError.html]
 [test_browserElement_inproc_DataURI.html]
 [test_browserElement_inproc_DisallowEmbedAppsInOOP.html]
-skip-if = os == "android" || toolkit == 'gonk' || buildapp != 'mulet' # embed-apps doesn't work in the mochitest app
+skip-if = buildapp != 'mulet'
 [test_browserElement_inproc_DocumentFirstPaint.html]
 [test_browserElement_inproc_Download.html]
 disabled = bug 1022281