Remove use of GetDefaultProfile from chrome_browser_main.
Remove use of GetDefaultProfile from chrome_browser_main.

Because GetLastUsedProfile falls back to the Default (that is, initial) profile directory if there is no last used entry in the prefs, we don't need two cases here.

BUG=83792
TEST=Browser starts up with the correct profile.

Review URL: http://codereview.chromium.org/8355016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@106502 0039d316-1c4b-4281-b951-d872f2087c98

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