Eliminate the CALENDAR_PICKER compile time flag as only android uses this flag and the web facing pieces that use this are already hidden behind a different compile time flag: ENABLE_INPUT_MULTIPLE_FIELDS_UI

BUG=none

Review URL: https://codereview.chromium.org/52553008

git-svn-id: svn://svn.chromium.org/blink/trunk@161353 bbb929c8-8fbe-4397-9dbb-9b2b20218538