Fix JNI Zero bugs

- Generated header guards now escape `$` in java class names
- Generated header file names now replace `$` with `__` because siso
  does not like it.
- Fixes issue where removing generics can stick a type name with a param
  name. Now we add a space in place of generics but strip spaces from
  types.
- Remove unneeded dependency on build from sample.

Change-Id: Ic4806a467e462d833f2d76329c3f6ef6d94c1c15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5739033
Commit-Queue: Sam Maier <smaier@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Auto-Submit: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1332580}