Bug 1386219 - Fix the regression introduced by bug 1367455. r=jonco

js/src/gc/GCRuntime.h

@@ -221,7 +221,7 @@ class GCSchedulingTunables
         gcMaxNurseryBytes_(0),
         gcZoneAllocThresholdBase_(30 * 1024 * 1024),
         zoneAllocThresholdFactor_(0.9),
-        zoneAllocThresholdFactorAvoidInterrupt_(0.95),
+        zoneAllocThresholdFactorAvoidInterrupt_(0.9),
         zoneAllocDelayBytes_(1024 * 1024),
         dynamicHeapGrowthEnabled_(false),
         highFrequencyThresholdUsec_(1000 * 1000),