[Android] remove dots from log tags

That causes tags to be elided in crash reports. This patch
replaces the dots by '_'. The 'cr.' prefix is also removed
as it is unnecessary now.

BUG=533072

Review URL: https://codereview.chromium.org/1389633002

Cr-Commit-Position: refs/heads/master@{#353992}
11 files changed