Bug 1502321 - Remove unexpected log in the Java Sampling code r=m_kato

Differential Revision: https://phabricator.services.mozilla.com/D9905

--HG--
extra : moz-landing-system : lando

mobile/android/base/java/org/mozilla/gecko/GeckoJavaSampler.java

@@ -140,7 +140,6 @@ public class GeckoJavaSampler {
                 return (sample.mJavaTime -
                     SystemClock.elapsedRealtime()) + getProfilerTime();
             }
-            System.out.println("Sample: " + sample.mTime);
             return sample.mTime;
         }
         return 0;