Add dependencies on mojo_application_bindings in content_common.gypi

Add dependencies on mojo_application_bindings in content_common.gypi

service_registry_impl.h includes service_provider.mojom.h, and thus
content_common should both depend on mojom_application_bindings and export that
dependency to its dependents.

To work around a problem wherein the Android build fails due to duplicate
generated files if there are two targets that both (a) compile Java and (b)
directly depend on a target processing mojoms, this CL removes the dependency
of content_java_test_support on content_common. That direct dependency doesn't
appear necessary.

Review URL: https://codereview.chromium.org/743093004

Cr-Commit-Position: refs/heads/master@{#306994}