Makes the credit card number field show obfuscated text. When the user focus the entry the text is cleared.
Makes the credit card number field show obfuscated text. When the user
focus the entry the text is cleared.

BUG=49988
TEST=see bug

Review URL: http://codereview.chromium.org/3039026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@53514 0039d316-1c4b-4281-b951-d872f2087c98

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