Bug 1305271 - Only enable Java profiling on Android; r=bustage on CLOSED TREE

Only enable Java profiling (and access jni::IsFennec) on Android, where
Java profiling makes sense.

tools/profiler/core/GeckoSampler.cpp

@@ -192,8 +192,6 @@ GeckoSampler::GeckoSampler(double aInterval, int aEntrySize,
   mUseStackWalk = hasFeature(aFeatures, aFeatureCount, "stackwalk");
 
   mProfileJS = hasFeature(aFeatures, aFeatureCount, "js");
-  mProfileJava = mozilla::jni::IsFennec() &&
-      hasFeature(aFeatures, aFeatureCount, "java");
   mProfileGPU = hasFeature(aFeatures, aFeatureCount, "gpu");
   mProfilePower = hasFeature(aFeatures, aFeatureCount, "power");
   // Users sometimes ask to filter by a list of threads but forget to request
@@ -215,6 +213,13 @@ GeckoSampler::GeckoSampler(double aInterval, int aEntrySize,
   }
 #endif
 
+#if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
+  mProfileJava = mozilla::jni::IsFennec() &&
+      hasFeature(aFeatures, aFeatureCount, "java");
+#else
+  mProfileJava = false;
+#endif
+
   // Deep copy aThreadNameFilters
   MOZ_ALWAYS_TRUE(mThreadNameFilters.resize(aFilterCount));
   for (uint32_t i = 0; i < aFilterCount; ++i) {