Make combined native/manual JNI registration work for clang.

base/android/jni_generator/jni_generator.py

Index: base/android/jni_generator/jni_generator.py
diff --git a/base/android/jni_generator/jni_generator.py b/base/android/jni_generator/jni_generator.py
index 54fea6babfb2299c8d7714ef65edbdea348ea1f0..3182036cd00cdec530646638099282efba5af90b 100755
--- a/base/android/jni_generator/jni_generator.py
+++ b/base/android/jni_generator/jni_generator.py
@@ -1073,8 +1073,10 @@ static ${RETURN} ${NAME}(JNIEnv* env, ${PARAMS});
 """
     if self.options.native_exports:
       template_str += """
-__attribute__((visibility("default"), alias("${NAME}")))
-${RETURN} ${STUB_NAME}(JNIEnv* env, ${PARAMS});
+__attribute__((visibility("default")))
+${RETURN} ${STUB_NAME}(JNIEnv* env, ${PARAMS}) {
+  return ${NAME}(${PARAMS_IN_CALL});
+}
 """
     template = Template(template_str)
     params_in_call = []