bluetooth: Improve GATT disconnected error message.

third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp

Index: third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp
diff --git a/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp b/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp
index 8697c84e5df8796412672f69a15431ab80912994..384c5cedd4a342e75c8d0c43d5a51a4a54f16866 100644
--- a/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp
+++ b/third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp
@@ -21,10 +21,9 @@ namespace blink {
 
 namespace {
 
-const char kGATTServerDisconnected[] =
-    "GATT Server disconnected while retrieving services.";
 const char kGATTServerNotConnected[] =
-    "GATT Server is disconnected. Cannot retrieve services.";
+    "GATT Server is disconnected. Cannot retrieve services. (Re)connect first "
+    "with `device.gatt.connect`.";
 
 }  // namespace
 
@@ -108,7 +107,7 @@ void BluetoothRemoteGATTServer::GetPrimaryServicesCallback(
   // If the device is disconnected, reject.
   if (!RemoveFromActiveAlgorithms(resolver)) {
     resolver->reject(
-        DOMException::create(NetworkError, kGATTServerDisconnected));
+        DOMException::create(NetworkError, kGATTServerNotConnected));
     return;
   }