Update nacl-helper perf_expectations for the linux bot.
Update nacl-helper perf_expectations for the linux bot.

Sizes step went red on build #61122, where nacl_helper is 8529744.
http://build.chromium.org/p/chromium/builders/Linux/builds/61122

The previous build #61121 nacl_helper was 8529200 bytes:
http://build.chromium.org/p/chromium/builders/Linux/builds/61121

BUG=480093

Review URL: https://codereview.chromium.org/1080393010

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#326455}

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