A quick fix for Issue 18708....

webkit/api/src/gtk/WebInputEventFactory.cpp

Index: webkit/api/src/gtk/WebInputEventFactory.cpp
===================================================================
--- webkit/api/src/gtk/WebInputEventFactory.cpp	(revision 22706)
+++ webkit/api/src/gtk/WebInputEventFactory.cpp	(working copy)
@@ -208,10 +208,14 @@
     switch (event->keyval) {
     // We need to treat the enter key as a key press of character \r.  This
     // is apparently just how webkit handles it and what it expects.
+    // On the other hand, IE and Firefox treat the control+enter keys as a key
+    // press of character '\n'. We also emulate this behavior since Google
+    // Docs and Spreadsheets depend on it.
     case GDK_ISO_Enter:
     case GDK_KP_Enter:
     case GDK_Return:
-        result.unmodifiedText[0] = result.text[0] = static_cast<WebUChar>('\r');
+        result.unmodifiedText[0] = result.text[0] =
+            static_cast<WebUChar>((event->state & GDK_CONTROL_MASK) ? '\n' : '\r');
         break;
     default:
         // This should set text to 0 when it's not a real character.