Rebaseline multipicturedraw GMs

This is clean up after https://codereview.chromium.org/753253002/ (Use variable length key (rather than accumulated matrix) as save layer hoisting key)

TBR=halcanary@google.com

Review URL: https://codereview.chromium.org/783523002
diff --git a/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json b/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
index 1ed7598..4e19ea9 100644
--- a/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
+++ b/expectations/gm/Test-Win8-ShuttleA-HD7770-x86-Release/expected-results.json
@@ -10315,7 +10315,7 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          5895899203449139966
+          6343009307364501166
         ]
       ], 
       "reviewed-by-human": true
@@ -10342,7 +10342,7 @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          15979130672036699868
+          14463107420821770322
         ]
       ], 
       "reviewed-by-human": true