Remove the ability of webpages to specify strings for the onbeforeunload dialog.

third_party/WebKit/Source/core/page/ChromeClient.cpp

Index: third_party/WebKit/Source/core/page/ChromeClient.cpp
diff --git a/third_party/WebKit/Source/core/page/ChromeClient.cpp b/third_party/WebKit/Source/core/page/ChromeClient.cpp
index 24c6fbdb12632bfb7d30ffb77e5dff745214b70f..fc73d76016251fedb87d6203f91b4071c97db7ae 100644
--- a/third_party/WebKit/Source/core/page/ChromeClient.cpp
+++ b/third_party/WebKit/Source/core/page/ChromeClient.cpp
@@ -93,8 +93,8 @@ static bool openJavaScriptDialog(LocalFrame* frame, const String& message, Chrom
 bool ChromeClient::openBeforeUnloadConfirmPanel(const String& message, LocalFrame* frame, bool isReload)
 {
     ASSERT(frame);
-    return openJavaScriptDialog(frame, message, ChromeClient::HTMLDialog, [this, frame, &message, isReload]() {
-        return openBeforeUnloadConfirmPanelDelegate(frame, message, isReload);
+    return openJavaScriptDialog(frame, message, ChromeClient::HTMLDialog, [this, frame, isReload]() {
+        return openBeforeUnloadConfirmPanelDelegate(frame, isReload);
     });
 }