Remove no longer needed baseline file

This tracks the change in the release branch.


Commit migrated from https://github.com/dotnet/corefx/commit/d6cc7539e526de14dd1e5f5d7caa88a2bbe9d8f1

src/libraries/System.Diagnostics.Tracing/src/ApiCompatBaseline.net462.txt

-CannotMakeMoreVisible : Visibility of member 'System.Diagnostics.Tracing.EventListener.EventSourceIndex(System.Diagnostics.Tracing.EventSource)' is 'Family' in the implementation but 'Public' in the contract.
-MembersMustExist : Member 'System.Diagnostics.Tracing.EventSource.add_EventCommandExecuted(System.EventHandler<System.Diagnostics.Tracing.EventCommandEventArgs>)' does not exist in the implementation but it does exist in the contract.
-MembersMustExist : Member 'System.Diagnostics.Tracing.EventSource.remove_EventCommandExecuted(System.EventHandler<System.Diagnostics.Tracing.EventCommandEventArgs>)' does not exist in the implementation but it does exist in the contract.
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