Remove API_TIMELINE_DURATION from Dart_ReadKernelBinary.
Remove API_TIMELINE_DURATION from Dart_ReadKernelBinary.

This allows Dart_ReadKernelBinary to be called before Dart_Initialize.

R=rmacnak@google.com

Review-Url: https://codereview.chromium.org/2951213002 .

dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk