Move memory FYI slaves to memory full master and switch configs over.

scripts/slave/gatekeeper_trees.json

 {
     "chromiumos": {
         "masters": {
             "https://build.chromium.org/p/chromiumos": ["*"],
             "https://build.chromium.org/p/chromium.chromiumos": ["*"]
         }
    },
    "build": {
         "build-db": "build_db.json",
         "masters": {
@@ skipping 123 matching lines @@
     },
     "chromium.perf": {
         "masters": {
             "https://build.chromium.org/p/chromium.perf": ["*"]
         }
     },
     "non-closers": {
         "masters": {
             "https://build.chromium.org/p/chromium.fyi": ["*"],
             "https://build.chromium.org/p/chromium.lkgr": ["*"],
-            "https://build.chromium.org/p/chromium.memory.fyi": ["*"],

[benwells, 2016/07/28 08:14:15]

This is deliberately making chromium.memory.full a closer (that's the point of
making it .full, not .fyi).

             "https://build.chromium.org/p/client.boringssl": ["*"],
             "https://build.chromium.org/p/client.catapult": ["*"],
             "https://build.chromium.org/p/client.crashpad": ["*"],
             "https://build.chromium.org/p/client.libvpx": ["*"]
         }
     }
 }