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The password manager was incorrectly down-casting from WebNode to WebInputElement and then upon method invocation, was crashing.  This change adds extra checks to |FindFormInputElements| before down-casting.  Also, when "name" attributes are ambiguous, the code now rejects filling.  This fixes the case where password text can erroneously get filled in the username field.

BUG=29352
TEST=PasswordAutocompleteManagerTest.*, and manual according to bugs.

Review URL: http://codereview.chromium.org/6271007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71806 0039d316-1c4b-4281-b951-d872f2087c98