Replace use of deprecated CG methods.

expectations/gm/Test-Win8-ShuttleA-HD7770-x86_64-Debug/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 5122 matching lines @@
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }, 
     "dftext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          15579862310139097370
+          8420356960539158456
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "discard_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11635187478196931850
         ]
@@ skipping 7164 matching lines @@
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }, 
     "shadertext2_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          3831063373917728128
+          3842687298137299011
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "shadertext2_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          11361790156959481856
+          9281955663584814698
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "shadertext2_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           2811553342126518865
         ]
@@ skipping 1797 matching lines @@
           "bitmap-64bitMD5", 
           14238495105637549536
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "varied_text_clipped_lcd_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          14699863291227746930
+          4737335735437517136
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "varied_text_clipped_no_lcd_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           15174997355459806999
         ]
@@ skipping 424 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           18282805787534784798
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }