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Part of work to use standard font sizes instead of "DeriveFont +/- N Pixels". Also per direction of designers and PM to move to Medium non-bold instead of "offsize" bold font for titles and headers.
Changed UIs were seen and ok-ed by either sgabriel@ or kuscher@.

Please see crbug.com/166679 for details and screenshots

BUG=166679, 137349
TEST=manual
for sad tab: navigate to chrome://crash
for password generation bubble: run with flag --enable-password-generation, navigate to www.target.com and begin to create an account, click on password text box
for global error bubble: I modified code in browser.cc to force an error
for extension: Chrome Web Store -> Extensitons -> Click on ADD TO CHROME


Review URL: https://chromiumcodereview.appspot.com/11698005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175468 0039d316-1c4b-4281-b951-d872f2087c98