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Fix all forward-declares and header files referencing CommandLine.

This keeps a "using base::CommandLine" in the command line header file so that the rest of the source files can be changes in a follow-up.

TBR=sky

Review URL: https://codereview.chromium.org/196413016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257514 0039d316-1c4b-4281-b951-d872f2087c98