Handle the "key" field as opposed to keyIdentifier field.

third_party/WebKit/Source/core/html/HTMLButtonElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLButtonElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLButtonElement.cpp b/third_party/WebKit/Source/core/html/HTMLButtonElement.cpp
index dafd505859ca30632298034b5b5eab6c0c43f13d..5c1ac88ad44e74fe4a22e6b386e65454fc20d055 100644
--- a/third_party/WebKit/Source/core/html/HTMLButtonElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLButtonElement.cpp
@@ -126,7 +126,7 @@ void HTMLButtonElement::defaultEventHandler(Event* event)
     }
 
     if (event->isKeyboardEvent()) {
-        if (event->type() == EventTypeNames::keydown && toKeyboardEvent(event)->keyIdentifier() == "U+0020") {
+        if (event->type() == EventTypeNames::keydown && toKeyboardEvent(event)->key() == " ") {
             setActive(true);
             // No setDefaultHandled() - IE dispatches a keypress in this case.
             return;
@@ -143,7 +143,7 @@ void HTMLButtonElement::defaultEventHandler(Event* event)
                 return;
             }
         }
-        if (event->type() == EventTypeNames::keyup && toKeyboardEvent(event)->keyIdentifier() == "U+0020") {
+        if (event->type() == EventTypeNames::keyup && toKeyboardEvent(event)->key() == " ") {
             if (active())
                 dispatchSimulatedClick(event);
             event->setDefaultHandled();