ash: Use big char such as 'G' to calculate minimum title width.
ash: Use big char such as 'G' to calculate minimum title width.

GetAverageCharacterWidth does not work well for title because there are many
upper case chars there. As a result, 15 chars are not guaranteed to be visible.

BUG=119496
TEST=We should always be able to see 15 chars in app list title.

Review URL: https://chromiumcodereview.appspot.com/9835058

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@128609 0039d316-1c4b-4281-b951-d872f2087c98

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