Remove 'Enable' button on unsupported platforms. Added 'No hosts' message.

remoting/webapp/_locales/en/messages.json

 {
   "ACCESS_CODE": {
     "message": "Access code",
     "description": "Label for the access code entry box. This is where the client user enters the code that permits access to the host."
   },
   "ACCESS_CODE_TIMER": {
     "message": "This access code will expire in $timeout$",
     "description": "Text displayed when the access code is due to time out within 30 seconds.",
     "placeholders": {
       "timeout": {
@@ skipping 188 matching lines @@
     "description": "Description of the 'access' or 'client' functionality, displayed next to a button that instigates an access operation."
   },
   "HOME_DAEMON_ACTIVE_MESSAGE": {
     "message": "You may securely access this computer using Chromoting.",
     "description": "Message displayed when the current computer is accepting remote connections."
   },
   "HOME_DAEMON_CHANGE_PIN_LINK": {
     "message": "Change PIN",
     "description": "Hyperlink displayed immediately after the message indicating that the current computer is accepting remote connectins. Clicking this link allows the user to change the PIN (personal identification number) for accessing this host."
   },
-  "HOME_DAEMON_DISABLED_MESSAGE": {
-    "message": "Sharing this computer for any-time access is not yet supported on this platform\u2026 stay tuned.",
-    "description": "Message displayed when the current computer is not accepting remote connections, instructing the user how to enable them."
-  },
   "HOME_DAEMON_STOP_BUTTON": {
     "message": "Disable remote connections",
     "description": "Button displayed when the current computer is accepting remote connections. Clicking this button causes it to stop accepting remote connections."
   },
   "HOME_DAEMON_START_BUTTON": {
     "message": "Enable remote connections",
     "description": "Button displayed when the current computer is not accepting remote connections. Clicking this button causes it to start accepting remote connections."
   },
   "HOME_DAEMON_START_MESSAGE": {
     "message": "You must enable remote connections if you want to use Chromoting to access this computer.",
     "description": "Message displayed when the current computer is not accepting remote connections, instructing the user how to enable them."
   },
+  "HOST_LIST_EMPTY": {
+    "message": "You have no computers registered. You can add a computer here by installing Chromoting on it and clicking $boldBegin$$buttonName$$boldEnd$.",
+    "description": "Message displayed to the user if there are no hosts registered to their account, informing them how to set up a host.",
+    "placeholders": {
+      "boldBegin": {
+        "content": "$1",
+        "example": "<b>"
+      },
+      "buttonName": {
+        "content": "$2",
+        "example": "Enable remote connections"
+      },
+      "boldEnd": {
+        "content": "$3",
+        "example": "</b>"
+      }
+    }
+
+  },
   "HOST_SETUP_CRASH_REPORTING_MESSAGE": {
     "message": "Help us improve Chromoting by allowing us to collect usage statistics and crash reports.",
     "description": "Message displayed next to the checkbox that the user can select to allow crash dump collection and reporting."
   },
   "HOST_SETUP_DIALOG_DESCRIPTION": {
     "message": "To protect access to this computer, please choose a PIN. This PIN will be required when connecting from another location.",
     "description": "Explanatory text displayed when the user enables remote access or changes the PIN."
   },
   "HOST_SETUP_HOST_FAILED": {
     "message": "Failed to start remote access service.",
@@ skipping 225 matching lines @@
   },
   "WARNING_NAT_DISABLED": {
     "message": "NOTE: Policy settings permit connections only between computers within your network.",
     "description": "Message displayed at the bottom of the host screen if local policy dictates that NAT traversal is disabled, meaning that connections outside the local network will not work."
   },
   "WHY_IS_THIS_SAFE": {
     "message": "Why is this safe?",
     "description": "Help link displayed when the user enables the host on this computer. Clicking this link opens a page that explains why this operation is safe. This string appears in a UI with limited horizontal space. Please try to keep translations no more than about 30 characters."
   }
 }