Don't read Linux host configuration if binary is not on path.

remoting/host/plugin/daemon_controller_linux.cc

Index: remoting/host/plugin/daemon_controller_linux.cc
diff --git a/remoting/host/plugin/daemon_controller_linux.cc b/remoting/host/plugin/daemon_controller_linux.cc
index 5083785347e150e5f1da694afe4630a319c34507..52afb0c2bc285a85223a3c8d9d04f63bad114a88 100644
--- a/remoting/host/plugin/daemon_controller_linux.cc
+++ b/remoting/host/plugin/daemon_controller_linux.cc
@@ -192,17 +192,23 @@ FilePath DaemonControllerLinux::GetConfigPath() {
 }
 
 void DaemonControllerLinux::DoGetConfig(const GetConfigCallback& callback) {
-  JsonHostConfig config(GetConfigPath());
-  scoped_ptr<base::DictionaryValue> result;
-  if (config.Read()) {
-    result.reset(new base::DictionaryValue());
-
-    std::string value;
-    if (config.GetString(kHostIdConfigPath, &value))
-      result->SetString(kHostIdConfigPath, value);
-    if (config.GetString(kXmppLoginConfigPath, &value))
-      result->SetString(kXmppLoginConfigPath, value);
+  scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue());
+
+  if (GetState() != remoting::DaemonController::STATE_NOT_IMPLEMENTED) {
+    JsonHostConfig config(GetConfigPath());
+    if (config.Read()) {
+      std::string value;
+      if (config.GetString(kHostIdConfigPath, &value)) {
+        result->SetString(kHostIdConfigPath, value);
+      }
+      if (config.GetString(kXmppLoginConfigPath, &value)) {
+        result->SetString(kXmppLoginConfigPath, value);
+      }
+    } else {
+      result.reset(); // Return NULL in case of error.
+    }
   }
+
   callback.Run(result.Pass());
 }