Convert now component to use GCM rather than pushMessaging.

chrome/browser/resources/google_now/manifest.json

Index: chrome/browser/resources/google_now/manifest.json
diff --git a/chrome/browser/resources/google_now/manifest.json b/chrome/browser/resources/google_now/manifest.json
index 1eb6e9111076150bc34740b611115f068e6e2da9..bdca32298b87583a24e5df2d461578ddfc4b76fd 100644
--- a/chrome/browser/resources/google_now/manifest.json
+++ b/chrome/browser/resources/google_now/manifest.json
@@ -11,16 +11,17 @@
   "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAkhqJr32OFD/bMXW4Md7jMfd7LbwHXVc6x5bBQG5U+dloofoxrICDR20yur/40mQ8O//0sS1b8srvbab1CRlSrxoNCr9T80NAkfzx0gHyVS+p1Zow+1FzLMu9PiGwwFyN80HIB7GI/dIa0wC9K/2OrrzcHEhVH96DacTtWQqjfDVtZPjT7Xwv23dgoWcpbkRC86jMJot3dmX9xnn0KzoVc9gDOHSIkBLbkkr6Sp3LGXCCM4L0DJgxdFwaLr5WBzgC3y5x0/wwPIwN4PtIaK3BhH6njlksfnKwwIJ9iRT41V4BqbWu4mszO/7VJ3HJyw2DBpIc2grU9ZRRxrV3fRQG4wIDAQAB",
   "permissions": [
     "alarms",
+    "gcm",
     "identity",
     "metricsPrivate",
     "notifications",
-    "pushMessaging",
     "storage",
     "tabs",
     "webstorePrivate",
     "*://*.google.com/*",
     "*://*.gstatic.com/*",
     "https://*.googleapis.com/chromenow/v1/*",
+    "https://*.googleapis.com/gcm/*",
     "https://*.googleusercontent.com/*"
   ],
   "optional_permissions": ["background"],
@@ -31,6 +32,9 @@
   },
   "oauth2": {
     "auto_approve": true,
-    "scopes": ["https://www.googleapis.com/auth/googlenow"]
+    "scopes": [
+      "https://www.googleapis.com/auth/gcm",
+      "https://www.googleapis.com/auth/googlenow"
+    ]
   }
 }