AutoFill fills only clicked field when form was filled prior.

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
diff --git a/chrome/renderer/render_view.cc b/chrome/renderer/render_view.cc
index aa6fc64d694b5605ec4df2e0600bcc31130d7f0c..59ec64a7f3b3d3a72f891e94b11b265afe287a74 100644
--- a/chrome/renderer/render_view.cc
+++ b/chrome/renderer/render_view.cc
@@ -2111,7 +2111,14 @@ void RenderView::didAcceptAutoFillSuggestion(const WebKit::WebNode& node,
     // The form has been auto-filled, so give the user the chance to clear the
     // form.
     form_manager_.ClearFormWithNode(node);
+  } else if (form_manager_.FormWithNodeIsAutoFilled(node)) {
+    // Fill a specific field value.
+    // Cast away const'ness in this case where we're filling the element
+    // directly.
+    WebInputElement element = node.toConst<WebInputElement>();
+    element.setValue(value);
   } else {
+    // Fill the values for the whole form.
     QueryAutoFillFormData(node, value, label, AUTOFILL_FILL);
   }