Roll mini_chromium to 8773bfd3a0006ee8795b296b6f772e08b7d518c5
Roll mini_chromium to 8773bfd3a0006ee8795b296b6f772e08b7d518c5

Includes:
- win: Default build to x64

TBR=mark@chromium.org
BUG=crashpad:1

Review URL: https://codereview.chromium.org/981413002

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