<webview>: Move JavaScript Dialog API to chrome

chrome/browser/guestview/webview/webview_constants.cc

Index: chrome/browser/guestview/webview/webview_constants.cc
diff --git a/chrome/browser/guestview/webview/webview_constants.cc b/chrome/browser/guestview/webview/webview_constants.cc
index 54087a47f815bf3cafb39915dd223f68c7a12ea9..2bd5e6996939acf9c55452d908da78c677657aca 100644
--- a/chrome/browser/guestview/webview/webview_constants.cc
+++ b/chrome/browser/guestview/webview/webview_constants.cc
@@ -27,12 +27,15 @@ const char kEventUnresponsive[] = "webview.onUnresponsive";
 const char kEventZoomChange[] = "webview.onZoomChange";
 
 // Parameters/properties on events.
+const char kDefaultPromptText[] = "defaultPromptText";
 const char kFindSearchText[] = "searchText";
 const char kFindFinalUpdate[] = "finalUpdate";
 const char kLastUnlockedBySelf[] = "lastUnlockedBySelf";
 const char kLevel[] = "level";
 const char kLine[] = "line";
 const char kMessage[] = "message";
+const char kMessageText[] = "messageText";
+const char kMessageType[] = "messageType";
 const char kNewHeight[] = "newHeight";
 const char kNewURL[] = "newUrl";
 const char kNewWidth[] = "newWidth";