Delete getConstants from ImageEditingManager

Summary:
`NativeImageEditor` doesn't export any constants. Therefore, `ImageEditingManager` doesn't need a `getConstants()` method. In a subsequent diff (D18888735), I rename all `ReactMethod getConstants()` methods to `Override getTypedExportedConstants()`. This raises an error because the spec for `ImageEditingManager` doesn't contain a `getTypedExportedConstants()` method.

Changelog:
[Internal] - Delete getConstants() from ImageEditingManager

Reviewed By: fkgozali

Differential Revision: D18909419

fbshipit-source-id: 7e4f84f102068aa44bb3d267c66a60c0d0d27404

ReactAndroid/src/main/java/com/facebook/react/modules/camera/ImageEditingManager.java

@@ -42,9 +42,7 @@ import java.io.OutputStream;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
-import java.util.Map;
 
 /** Native module that provides image cropping functionality. */
 @ReactModule(name = ImageEditingManager.NAME)
@@ -99,11 +97,6 @@ public class ImageEditingManager extends ReactContextBaseJavaModule {
     return NAME;
   }
 
-  @Override
-  public Map<String, Object> getConstants() {
-    return Collections.emptyMap();
-  }
-
   @Override
   public void onCatalystInstanceDestroy() {
     new CleanTask(getReactApplicationContext()).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);