Let the utility process access memory-infra

BUG=712753

Review-Url: https://codereview.chromium.org/2827813002
Cr-Commit-Position: refs/heads/master@{#465656}

content/public/app/mojo/content_browser_manifest.json

@@ -45,6 +45,9 @@
         ],
         "service_manager:service_factory": [
           "service_manager::mojom::ServiceFactory"
+        ],
+        "utility": [
+          "memory_instrumentation::mojom::Coordinator"
         ]
       },
       "requires": {

content/public/app/mojo/content_utility_manifest.json

@@ -14,6 +14,7 @@
         ]
       },
       "requires": {
+        "content_browser": [ "utility" ],
         "device": [
           "device:power_monitor",
           "device:time_zone_monitor"