Don't use a special downsampler in ImageManager

It doesn't work for non exact sizing.

library/src/com/bumptech/glide/resize/ImageManager.java

@@ -80,23 +80,6 @@ public class ImageManager {
     private final DiskCache diskCache;
     private final SafeKeyGenerator safeKeyGenerator = new SafeKeyGenerator();
 
-    //special downsampler that doesn't check exif, and assumes inWidth and inHeight == outWidth and outHeight so it
-    //doesn't need to read the image header for size information
-    private static Downsampler DISK_CACHE_DOWNSAMPLER = new Downsampler() {
-
-        @Override
-        public Bitmap downsample(RecyclableBufferedInputStream bis, BitmapFactory.Options options, BitmapPool pool,
-                int outWidth, int outHeight) {
-            return downsampleWithSize(bis, options, pool, outWidth, outHeight, 1);
-        }
-
-        @Override
-        protected int getSampleSize(int inWidth, int inHeight, int outWidth, int outHeight) {
-            return 0;
-        }
-    };
-
-
     /**
      * Get the maximum safe memory cache size for this particular device based on the # of mb allocated to each app.
      * This is a conservative estimate that has been safe for 2.2+ devices consistently. It is probably rather small
@@ -620,7 +603,7 @@ private Bitmap getFromDiskCache(String key) {
             Bitmap result = null;
             final InputStream is = diskCache.get(key);
             if (is != null) {
-                result = resizer.load(is, width, height, DISK_CACHE_DOWNSAMPLER);
+                result = resizer.load(is, width, height, Downsampler.NONE);
                 if (result == null) {
                     diskCache.delete(key); //the image must have been corrupted
                 }