Fix Chromoting client startup warnings.

This fixes 2 minor start warnings:
* On platforms that have no remapKeys, we used to report a 'bad remapKey'
  warning.
* If there are no hostsettings, then we used to report a 'Not an object'
  warning when trying to load the host settings.

Review URL: https://codereview.chromium.org/305393003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274472 0039d316-1c4b-4281-b951-d872f2087c98

remoting/webapp/client_session.js

@@ -718,6 +718,10 @@ remoting.ClientSession.prototype.applyRemapKeys_ = function(apply) {
     remapKeys = '0x0700e4>0x0700e7';
   }
 
+  if (remapKeys == '') {
+    return;
+  }
+
   var remappings = remapKeys.split(',');
   for (var i = 0; i < remappings.length; ++i) {
     var keyCodes = remappings[i].split('>');

remoting/webapp/host_settings.js

@@ -81,14 +81,17 @@ remoting.HostSettings.loadInternal_ = function(hostId, callback) {
   var onDone = function(allHosts) {
     var result = {};
     try {
-      result = jsonParseSafe(allHosts[remoting.HostSettings.KEY_]);
-      if (typeof(result) != 'object') {
-        console.error("Error loading host settings: Not an object");
-        result = {};
-      } else if (/** @type {Object} */ (result).hasOwnProperty(hostId) &&
-                 typeof(result[hostId]) == 'object') {
-        callback(result[hostId], result);
-        return;
+      var hosts = allHosts[remoting.HostSettings.KEY_];
+      if (hosts) {
+        result = jsonParseSafe(hosts);
+        if (typeof(result) != 'object') {
+          console.error("Error loading host settings: Not an object");
+          result = {};
+        } else if (/** @type {Object} */ (result).hasOwnProperty(hostId) &&
+                   typeof(result[hostId]) == 'object') {
+          callback(result[hostId], result);
+          return;
+        }
       }
     } catch (err) {
       var typedErr = /** @type {*} */ (err);