TBA: Audit thirdparty picasso

Proxy-safe?

$ ls mobile/android/thirdparty/com/squareup/picasso/
Action.java                     ContentStreamBitmapHunter.java  GetAction.java                  PicassoDrawable.java            Stats.java                      Utils.java
AssetBitmapHunter.java          DeferredRequestCreator.java     ImageViewAction.java            PicassoExecutorService.java     StatsSnapshot.java              
BitmapHunter.java               Dispatcher.java                 LruCache.java                   Picasso.java                    TargetAction.java               
Cache.java                      Downloader.java                 MarkableInputStream.java        RequestCreator.java             Target.java                     
Callback.java                   FetchAction.java                MediaStoreBitmapHunter.java     Request.java                    Transformation.java             
ContactsPhotoBitmapHunter.java  FileBitmapHunter.java           NetworkBitmapHunter.java        ResourceBitmapHunter.java       UrlConnectionDownloader.java