INPUT element: Fix a DCHECK failure in RadioInputType::findNextFocusableRadioButtonInGroup.

third_party/WebKit/Source/core/html/forms/RadioInputType.cpp

Index: third_party/WebKit/Source/core/html/forms/RadioInputType.cpp
diff --git a/third_party/WebKit/Source/core/html/forms/RadioInputType.cpp b/third_party/WebKit/Source/core/html/forms/RadioInputType.cpp
index 24c798ea6e2e1b5a7259c34e4ab1fd31c2e7f6e0..89da99e39345a10c0eeb4b69fd67cba3fb1b5486 100644
--- a/third_party/WebKit/Source/core/html/forms/RadioInputType.cpp
+++ b/third_party/WebKit/Source/core/html/forms/RadioInputType.cpp
@@ -110,6 +110,9 @@ void RadioInputType::handleKeydownEvent(KeyboardEvent* event) {
                      ? (key == "ArrowDown" || key == "ArrowLeft")
                      : (key == "ArrowDown" || key == "ArrowRight");
 
+  // Force layout for isFocusable() in findNextFocusableRadioButtonInGroup().
+  document.updateStyleAndLayoutIgnorePendingStylesheets();
+
   // We can only stay within the form's children if the form hasn't been demoted
   // to a leaf because of malformed HTML.
   HTMLInputElement* inputElement =