[Cronet] Don't include maven modules in cronet_package target

Maven modules will be generated with a new script as part of
http://crrev.com/c/1044349 instead of via GN build targets.

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: I02353acf51951b4d57fba2b846fca1fff8dfcf07
Reviewed-on: https://chromium-review.googlesource.com/1044357Reviewed-by: Misha Efimov <mef@chromium.org>
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556274}

components/cronet/android/BUILD.gn

@@ -1555,7 +1555,6 @@ group("cronet_package") {
     deps = [
       ":api_static_checks",
       ":copy_cronet_java8_jars",
-      ":cronet_maven_modules",
       ":cronet_package_copy",
       ":cronet_package_copy_native_lib",
       ":cronet_package_copy_native_lib_unstripped",