Fix of Issue 611692 - Chromium autoroller compilation is failing flakily
Fix of Issue 611692 - Chromium autoroller compilation is failing flakily

Renamed 'libcronet' target to 'libcronet_shared' in order to
avoid output file name conflict with 'cronet_framework' product_name.

BUG=611692

Review-Url: https://codereview.chromium.org/1985893002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#393967}

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