Use the new java_cpp_enum rule in net.

This moves most of the generated Java enums under net/ to use the
java_cpp_enum rule removing the need for keeping the enums in
separate list files and the need for the .template files.

BUG=405532

Review URL: https://codereview.chromium.org/599493004

Cr-Original-Commit-Position: refs/heads/master@{#297420}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f6ebbf6b7c4a6d0626979198cfca64cb92cb2833

get_landmines.py

@@ -56,6 +56,8 @@ def print_landmines():
   print '[chromium-dev] PSA: clobber build needed for IDR_INSPECTOR_* compil...'
   print 'blink_resources.grd changed: crbug.com/400860'
   print 'ninja dependency cycle: crbug.com/408192'
+  if platform() == 'android':
+    print 'Clobber: To delete stale generated .java files.'
 
 
 def main():