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These components are needed by chrome/common.

This also adds a "components" meta-target to avoid listing all components in the root build file.

TBR=blundell

Review URL: https://codereview.chromium.org/344993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278608 0039d316-1c4b-4281-b951-d872f2087c98