Remove MUST_USE_RESULT for Execution::TryCall.

TBR=ishell@chromium.org

Review URL: https://codereview.chromium.org/235003002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20681 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/execution.h

@@ -61,7 +61,7 @@ class Execution V8_FINAL : public AllStatic {
   // any thrown exceptions. The return value is either the result of
   // calling the function (if caught exception is false) or the exception
   // that occurred (if caught exception is true).
-  MUST_USE_RESULT static MaybeHandle<Object> TryCall(
+  static MaybeHandle<Object> TryCall(
       Handle<JSFunction> func,
       Handle<Object> receiver,
       int argc,