cros: Remove unneeded "Add fingerprint" button on OOBE

This code is only used in OOBE so it is safe to just remove it.

Bug: 890367
Change-Id: I54130cc3c115c1a1356a045f443a8a19962686f8
Reviewed-on: https://chromium-review.googlesource.com/c/1279162Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599381}

chrome/app/chromeos_strings.grdp

@@ -4154,9 +4154,6 @@
   <message name="IDS_OOBE_FINGERPINT_SETUP_SCREEN_BUTTON_ADD_ANOTHER" desc="In fingerprint setup screen, button label to add another fingerprint.">
     Add another
   </message>
-  <message name="IDS_OOBE_FINGERPINT_SETUP_SCREEN_BUTTON_ADD_FINGERPRINT" desc="In fingerprint setup screen, button label to add fingerprint.">
-    Add fingerprint
-  </message>
   <message name="IDS_OOBE_FINGERPINT_SETUP_SCREEN_NEW_FINGERPRINT_DEFAULT_NAME_1" desc="The default name for first newly added fingerprint.">
     Finger 1
   </message>

chrome/browser/resources/chromeos/login/fingerprint_setup.html

@@ -124,12 +124,6 @@
             [[i18nDynamic(locale, 'skipFingerprintSetup')]]
           </div>
         </oobe-text-button>
-        <oobe-text-button id="addFingerprint" class="focus-on-show"
-            hidden="[[!enrollInProgress_(percentComplete_)]]" disabled inverse>
-          <div>
-            [[i18nDynamic(locale, 'fingerprintSetupAddFingerprint')]]
-          </div>
-        </oobe-text-button>
         <oobe-text-button id="fingerprintAddAnother"
             hidden="[[!isAnotherButtonVisible_(percentComplete_,
                 canAddFinger)]]"

chrome/browser/ui/webui/chromeos/login/fingerprint_setup_screen_handler.cc

@@ -82,8 +82,6 @@ void FingerprintSetupScreenHandler::DeclareLocalizedValues(
                IDS_OOBE_FINGERPINT_SETUP_SCREEN_SENSOR_LOCATION_TITLE);
   builder->Add("enrollmentProgressScreenTitle",
                IDS_OOBE_FINGERPINT_SETUP_SCREEN_ENROLLMENT_PROGRESS_TITLE);
-  builder->Add("fingerprintSetupAddFingerprint",
-               IDS_OOBE_FINGERPINT_SETUP_SCREEN_BUTTON_ADD_FINGERPRINT);
   builder->Add("setupFingerprintEnrollmentSuccessTitle",
                IDS_OOBE_FINGERPINT_SETUP_SCREEN_ENROLLMENT_SUCCESS_TITLE);
   builder->Add("setupFingerprintEnrollmentSuccessDescription",