Rebaselines for tests affected by image filter PDF change.

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Debug/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 5438 matching lines @@
           "bitmap-64bitMD5", 
           4660236967370621790
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "dropshadowimagefilter_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          13023439110169898341
+          14938094761111292388
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "dropshadowimagefilter_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           8887194911837226938
         ]
@@ skipping 8195 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           10591909693224673086
         ]
       ], 
       "reviewed-by-human": false
     }
   }
 }