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In addition to the normal method reordering, this patch also deinlines
net/base/test_completion_callback.h and places the compiled code in the
net_test_support target. Minimization of that header also required adding
includes in a few unit tests.

BUG=68682
TEST=compiles

Review URL: http://codereview.chromium.org/6341004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72162 0039d316-1c4b-4281-b951-d872f2087c98