Do not enable the home button by default on new installs.  This doesn't affect the default home page.
Do not enable the home button by default on new installs.  This doesn't affect the default home page.

BUG=27570
TEST=A new install of Chrome should not have a home button on first run.
Review URL: http://codereview.chromium.org/1519023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@43788 0039d316-1c4b-4281-b951-d872f2087c98

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