frameworks/base/core/java/android/app/ActivityThread.java:4386: cannot find symbol
symbol  : method setTargetHeapMinFree(int)
location: class dalvik.system.VMRuntime
            VMRuntime.getRuntime().setTargetHeapMinFree(heapMinFree);
                                  ^
frameworks/base/core/java/android/app/ActivityThread.java:4390: cannot find symbol
symbol  : method setTargetHeapConcurrentStart(int)
location: class dalvik.system.VMRuntime
            VMRuntime.getRuntime().setTargetHeapConcurrentStart(heapConcurrentStart);
                                  ^