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Since I removed the IRT's calls to NaClSrpcModuleInit() and
NaClPluginLowLevelInitializationComplete(), the IRT no longer depends
on SRPC.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3864
TEST=build

Review URL: https://codereview.chromium.org/878623004

Cr-Commit-Position: refs/heads/master@{#313664}