Revert 63011 - Convert a lot of DCHECK()s to DCHECK_EQ() and similar, so that when they fail they print the values in question.
Revert 63011 - Convert a lot of DCHECK()s to DCHECK_EQ() and similar, so that when they fail they print the values in question.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/3828013

TBR=pkasting@chromium.org, jamesr@chromium.org
Review URL: http://codereview.chromium.org/3854004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63012 0039d316-1c4b-4281-b951-d872f2087c98

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