Handle type error on Object.defineProperty.
Handle type error on Object.defineProperty.

Calling the defineProperty for f.name is causing a
'TypeError: Cannot redefine property: name' error to be thrown when running
chrome://tracing.

This CL catches and ignores the error as it appears that the value is correclty
begin set.

BUG=
R=nduca@chromium.org

Review URL: https://codereview.appspot.com/13009045

git-svn-id: 3a56fcae908c7e16d23cb53443ea4795ac387cf2@889 0e6d7f2b-9903-5b78-7403-59d27f066143

bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer,bpsinc-native/src_third_party_trace-viewer