consolidate references to self to top of GetMetadata method
consolidate references to self to top of GetMetadata method

BUG=chromium:348667
TEST=Unit tests pass

Change-Id: I58ae3c05a3ea26e41de23537b54b3752b3f760c2
Reviewed-on: https://chromium-review.googlesource.com/188406
Reviewed-by: Aviv Keshet <178e8ae417efbe404feca7ab4cb8f0ba8c109369@chromium.org>
Tested-by: Aviv Keshet <178e8ae417efbe404feca7ab4cb8f0ba8c109369@chromium.org>
Commit-Queue: Aviv Keshet <178e8ae417efbe404feca7ab4cb8f0ba8c109369@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite