Roll reference builds to r221697.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index dbdf3e29ddfe4b7f8bc874ae209e23d27414d6b1..34d12a0d71eeb5459862c6e0c7cb4c1689e85983 100644
--- a/DEPS
+++ b/DEPS
@@ -258,7 +258,7 @@ deps = {
 deps_os = {
   "win": {
     "src/chrome/tools/test/reference_build/chrome_win":
-      "/trunk/deps/reference_builds/chrome_win@197743",
+      "/trunk/deps/reference_builds/chrome_win@221746",
 
     "src/third_party/cygwin":
       "/trunk/deps/third_party/cygwin@133786",
@@ -376,7 +376,7 @@ deps_os = {
   },
   "mac": {
     "src/chrome/tools/test/reference_build/chrome_mac":
-      "/trunk/deps/reference_builds/chrome_mac@197743",
+      "/trunk/deps/reference_builds/chrome_mac@221746",
 
     "src/third_party/GTM":
       (Var("googlecode_url") % "google-toolbox-for-mac") + "/trunk@" +
@@ -399,7 +399,7 @@ deps_os = {
   "unix": {
     # Linux, really.
     "src/chrome/tools/test/reference_build/chrome_linux":
-      "/trunk/deps/reference_builds/chrome_linux@197743",
+      "/trunk/deps/reference_builds/chrome_linux@221746",
 
     "src/third_party/xdg-utils":
       "/trunk/deps/third_party/xdg-utils@203785",