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mojo redefines ArraySizeHelper in the mojo namespace. When arraysize is used
in the mojo namespace, with both version in scope, the compiler, on android, is complaining that the reference is
not unique. To prevent this, qualify the usage of ArraySizeHelper in
base/macros.h

Review URL: https://codereview.chromium.org/804023002

Cr-Commit-Position: refs/heads/master@{#315290}