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This CL uses @NativeClassQualifiedName in CronetUrlRequestContext.java to reduce
JNI code. After the refactoring, cronet_url_request_context.cc is merged
with cronet_url_request_context_adapter.cc, since the former mostly contains
JNI code that will be generated by @NativeClassQualifiedName.

BUG=458276

Review URL: https://codereview.chromium.org/922283002

Cr-Commit-Position: refs/heads/master@{#317068}