Clean up fresco cache clearing code

Summary: I noticed we're doing too much manual work here, when Fresco has a nice handy shortcut for clearing all caches.

Reviewed By: kirwan

Differential Revision: D3791356

fbshipit-source-id: 4a55d0280e9483267741ae75383b50ca0b74c5c6

ReactAndroid/src/main/java/com/facebook/react/modules/fresco/FrescoModule.java

@@ -14,14 +14,11 @@
 import android.content.Context;
 import android.support.annotation.Nullable;
 
-import com.facebook.cache.common.CacheKey;
 import com.facebook.cache.disk.DiskCacheConfig;
-import com.facebook.common.internal.AndroidPredicates;
 import com.facebook.common.soloader.SoLoaderShim;
 import com.facebook.drawee.backends.pipeline.Fresco;
 import com.facebook.imagepipeline.backends.okhttp3.OkHttpImagePipelineConfigFactory;
 import com.facebook.imagepipeline.core.ImagePipelineConfig;
-import com.facebook.imagepipeline.core.ImagePipelineFactory;
 import com.facebook.imagepipeline.listener.RequestListener;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
@@ -81,11 +78,7 @@ public String getName() {
   @Override
   public void clearSensitiveData() {
     // Clear image cache.
-    ImagePipelineFactory imagePipelineFactory = Fresco.getImagePipelineFactory();
-    imagePipelineFactory.getBitmapMemoryCache().removeAll(AndroidPredicates.<CacheKey>True());
-    imagePipelineFactory.getEncodedMemoryCache().removeAll(AndroidPredicates.<CacheKey>True());
-    imagePipelineFactory.getMainFileCache().clearAll();
-    imagePipelineFactory.getSmallImageFileCache().clearAll();
+    Fresco.getImagePipeline().clearCaches();
   }
 
   private static ImagePipelineConfig getDefaultConfig(