[NaCl SDK] Add new SDK version: pepper_56

native_client_sdk/src/build_tools/json/naclsdk_manifest2.json

 {
   "bundles": [
     {
       "archives": [
         {
           "checksum": {
             "sha1": "c90944aa6dc45085f1a222396ffa2b6a86afdf3d"
           },
           "host_os": "all",
           "size": 31159,
@@ skipping 17 matching lines @@
       "description": "Visual Studio Add-In for building and debugging NaCl applications",
       "name": "vs_addin",
       "recommended": "no",
       "repath": "vs_addin",
       "revision": 1578,
       "stability": "dev",
       "version": 0
     },
     {
       "archives": [],
-      "description": "Chrome 46 bundle, revision xxxxx",
-      "name": "pepper_46",
-      "recommended": "no",
-      "repath": "pepper_46",
-      "revision": 0,
-      "stability": "post_stable",
-      "version": 46
-    },
-    {
-      "archives": [],
       "description": "Chrome 47 bundle, revision xxxxx",
       "name": "pepper_47",
       "recommended": "no",
       "repath": "pepper_47",
       "revision": 0,
       "stability": "post_stable",
       "version": 47
     },
     {
       "archives": [],
@@ skipping 20 matching lines @@
       "description": "Chrome 55 bundle, revision xxxxx",
       "name": "pepper_55",
       "recommended": "no",
       "repath": "pepper_55",
       "revision": 0,
       "stability": "post_stable",
       "version": 55
     },
     {
       "archives": [],
+      "description": "Chrome 56 bundle, revision xxxxx",
+      "name": "pepper_56",
+      "recommended": "no",
+      "repath": "pepper_56",
+      "revision": 0,
+      "stability": "post_stable",
+      "version": 56
+    },
+    {
+      "archives": [],
       "description": "Chrome Canary",
       "name": "pepper_canary",
       "recommended": "no",
       "repath": "",
       "revision": 0,
       "stability": "canary",
       "version": 0
     }
   ],
   "manifest_version": 2
 }