Revert "generate_gradle.py: Enable --all by default"

This reverts commit 2d59ecc793ec673f18364f229d0ebecac3a014c1.

Reason for revert: Broke --split-projects

Original change's description:
> generate_gradle.py: Enable --all by default
>
> Seems to be fast enough now!
>
> Bug: 620034
> Change-Id: I8d47bb8dbd63bb60678bd55cb23696b7b2304f95
> Reviewed-on: https://chromium-review.googlesource.com/772432
> Commit-Queue: agrieve <agrieve@chromium.org>
> Reviewed-by: Peter Wen <wnwen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#516879}

NOTRY=true
TBR=wnwen@chromium.org,agrieve@chromium.org

Bug: 620034, webrtc:8547
Change-Id: Idb72a9d30bc038dcf20e5576bd9cb5615ac1a6de
Reviewed-on: https://chromium-review.googlesource.com/777404
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517560}
2 files changed