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This modifies several scripts to call devil_chromium.Initialize()
correctly, rather than to call script_common.InitializeEnvironment(), to
use the better environment defaults provided by devil_chromium.

This should reduce adb server restarts by using a consistent adb binary
across all scripts.

Bug: 978697
Test: Run each script with -vv, verify it defaults to the correct adb binary
Test: Run each script with -vv and --adb-path, verify it uses the specified adb
Change-Id: Ib792dbeacec36f5fc6cd68593d27dc947fcfc2d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1705314Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678449}