Android: Remove apk modules for Android Studio

It is no longer necessary to list all the apk targets as separate
modules now that we have the _all pseudo module. Having the separate
modules resulted in bugs where Android Studio could not distinguish
between prod code and test code since some modules viewed dirs as prod
and some as test. The --split-projects flag can be used to see the
dependency graph, and when only a single module will be generated, the
_all pseudo module will not replace it.

For android studio's _all pseudo module, move all known test dirs to
androidTest instead of main so that they are properly displayed when
filtered.

BUG=620034

Review-Url: https://codereview.chromium.org/2837863002
Cr-Commit-Position: refs/heads/master@{#467704}
3 files changed