jni: Pass method parameters as JavaParamRef in printing.

Pass all object parameters to JNI methods in JavaParamRef<> wrappers.
This matches previous changes made to do this for JNI non-method
functions.

BUG=519562
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Review URL: https://codereview.chromium.org/1477783002

Cr-Commit-Position: refs/heads/master@{#361696}
2 files changed