Moving all widget picker tests to instrumentation tests

Bug: 196825541
Test: Presubmit
Change-Id: I946f29baedb2e6b29044f8df1bc73b74e9999efe

src/com/android/launcher3/BaseActivity.java

@@ -145,6 +145,7 @@ public abstract class BaseActivity extends Activity implements ActivityContext {
     /**
      * Returns {@link StatsLogManager} for user event logging.
      */
+    @Override
     public StatsLogManager getStatsLogManager() {
         if (mStatsLogManager == null) {
             mStatsLogManager = StatsLogManager.newInstance(this);