Revert of Remove PagePopup runtime flag (status=stable) for blink

Source/web/ChromeClientImpl.cpp

Index: Source/web/ChromeClientImpl.cpp
diff --git a/Source/web/ChromeClientImpl.cpp b/Source/web/ChromeClientImpl.cpp
index 0ce573cd484a1d81d5958139e02b90ababefa78d..ee5bdbe1b2693ecb9f3d38f744f804418b04287b 100644
--- a/Source/web/ChromeClientImpl.cpp
+++ b/Source/web/ChromeClientImpl.cpp
@@ -62,6 +62,7 @@
 #include "platform/FileChooser.h"
 #include "platform/NotImplemented.h"
 #include "platform/PlatformScreen.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "platform/exported/WrappedResourceRequest.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
@@ -581,8 +582,10 @@
 PassOwnPtr<ColorChooser> ChromeClientImpl::createColorChooser(LocalFrame* frame, ColorChooserClient* chooserClient, const Color&)
 {
     OwnPtr<ColorChooserUIController> controller;
-
-    controller = adoptPtr(new ColorChooserPopupUIController(frame, this, chooserClient));
+    if (RuntimeEnabledFeatures::pagePopupEnabled())
+        controller = adoptPtr(new ColorChooserPopupUIController(frame, this, chooserClient));
+    else
+        controller = adoptPtr(new ColorChooserUIController(frame, chooserClient));
     controller->openUI();
     return controller.release();
 }