Eric Seidel 54e652d365 Don't run adb as part of shelldb boot
This defers running adb until we actually need the device-id
which makes shelldb not crash when adb isn't avaiable.

I also fixed to use ADB_PATH.

Chinmay ran into this when trying shelldb on Mac.

R=chinmaygarde@google.com, iansf@google.com

Review URL: https://codereview.chromium.org/1161843007
2015-06-03 11:20:33 -07:00
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