Merge WebKit at r59636: Update v8 to r4660.

Will build and run with current webkit.

Change-Id: I57bae621fd894da363ba84e1757ad09eb7c502b9
diff --git a/samples/shell.cc b/samples/shell.cc
index 27ed293..1a13f5f 100644
--- a/samples/shell.cc
+++ b/samples/shell.cc
@@ -299,5 +299,10 @@
       printf("^");
     }
     printf("\n");
+    v8::String::Utf8Value stack_trace(try_catch->StackTrace());
+    if (stack_trace.length() > 0) {
+      const char* stack_trace_string = ToCString(stack_trace);
+      printf("%s\n", stack_trace_string);
+    }
   }
 }