Removed quick-unlock-fingerprint in about_flags.cc

Flag ownership has been revamped and quick-unlock-fingerprint is now
managed by:
https://cs.corp.google.com/chromeos_public/src/platform2/login_manager/chrome_setup.cc?rcl=763e67284e2b5dcd206030111bb94c413624c9f7&l=436

Bug: 907168
Change-Id: Ia3315636a0f9f006b613ab1d941554cf8874afea
Reviewed-on: https://chromium-review.googlesource.com/c/1379067
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622947}

chrome/browser/about_flags.cc

@@ -2743,9 +2743,6 @@ const FeatureEntry kFeatureEntries[] = {
     {"quick-unlock-pin", flag_descriptions::kQuickUnlockPinName,
      flag_descriptions::kQuickUnlockPinDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kQuickUnlockPin)},
-    {"quick-unlock-fingerprint", flag_descriptions::kQuickUnlockFingerprint,
-     flag_descriptions::kQuickUnlockFingerprintDescription, kOsCrOS,
-     FEATURE_VALUE_TYPE(features::kQuickUnlockFingerprint)},
 #endif  // OS_CHROMEOS
 #if defined(OS_ANDROID)
     {"no-credit-card-abort", flag_descriptions::kNoCreditCardAbort,