Use fast-local-dev in Cronet's cr_cronet.py script
Use fast-local-dev in Cronet's cr_cronet.py script

The previous CL missed a whitespace.

Review URL: https://codereview.chromium.org/1748083002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378292}

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