SearchFeatureProvider's context field is removed

SearchFeatureProvider was holding on to a context and
outlived the SettingsActivity, thus leaking the activity.
The context was passed into most methods, and thus it
makes more sense to pass it in to every method.

Bug: 33677967
Test: Run MakeSettingsRoboTests
Change-Id: Ia82f30e7e0b83587b4baeef28e81da6b8e4303fe

src/com/android/settings/overlay/FeatureFactoryImpl.java

@@ -104,9 +104,9 @@ public class FeatureFactoryImpl extends FeatureFactory {
     }
 
     @Override
-    public SearchFeatureProvider getSearchFeatureProvider(Context context) {
+    public SearchFeatureProvider getSearchFeatureProvider() {
         if (mSearchFeatureProvider == null) {
-            mSearchFeatureProvider = new SearchFeatureProviderImpl(context);
+            mSearchFeatureProvider = new SearchFeatureProviderImpl();
         }
         return mSearchFeatureProvider;
     }