b=911777 collect cycles before getting maxChannelCount to release some cubeb streams r=padenot

--HG--
extra : transplant_source : %C3W%96%C2J%B9%B4V%9C%C0yA%10%09%7B%B2%17%D8%E0R

content/media/webaudio/test/Makefile.in

@@ -49,10 +49,12 @@ MOCHITEST_FILES := \
   test_channelSplitterNode.html \
   test_channelSplitterNodeWithVolume.html \
   test_convolverNode.html \
+  test_convolverNodeChannelCount.html \
   test_convolverNodeWithGain.html \
   test_convolverNode_mono_mono.html \
   test_currentTime.html \
   test_delayNode.html \
+  test_delayNodeAtMax.html \
   test_delayNodeSmallMaxDelay.html \
   test_delayNodeWithGain.html \
   test_dynamicsCompressorNode.html \
@@ -105,13 +107,6 @@ MOCHITEST_FILES := \
   audio-quad.wav \
   $(NULL)
 
-ifneq ($(MOZ_DEBUG)+$(MOZ_WIDGET_TOOLKIT),+gtk2) # bug 911777
-MOCHITEST_FILES += \
-  test_convolverNodeChannelCount.html \
-  test_delayNodeAtMax.html \
-  $(NULL)
-endif # bug 911777
-
 ifneq ($(OS_TARGET),Android) # bug 912474
 MOCHITEST_FILES += \
   test_pannerNodeChannelCount.html \

content/media/webaudio/test/test_maxChannelCount.html

@@ -10,6 +10,10 @@
 <pre id="test">
 <script class="testbody" type="text/javascript">
 
+// Work around bug 911777
+SpecialPowers.forceGC();
+SpecialPowers.forceCC();
+
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(function() {
   var ac = new AudioContext();