GN(android): Distinguish java_binary from java_library in build_config

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index a1da43ab5aa138e4f34b3950b71af68f9ef40d04..5887a547d569f1a5493acd5146adcce86f6b92cd 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -889,12 +889,11 @@ template("java_strings_grd_prebuilt") {
 template("java_binary") {
   set_sources_assignment_filter([])
 
-  # TODO(cjhopman): This should not act like a java_library for dependents (i.e.
-  # dependents shouldn't get the jar in their classpath, etc.).
   java_library_impl(target_name) {
     forward_variables_from(invoker, "*")
     supports_android = false
     main_class = invoker.main_class
+    is_java_binary = true
   }
 }