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This CL splits the webapk_java GN template into two targets:
1) webapk_java
- Contains most of the source files of the old webapk_java template
- Does not depend on compiled_in_runtime_library_java
- shell_apk_javatests depends on webapk_java
2) webapk_with_service_java
- depends on webapk_java and compiled_in_runtime_library_java

BUG=817263

Change-Id: If234e939fc3ba5119dd9290256fab3a34c80b2fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585114
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654691}