[EasyUnlock] Observe proximity changes and clean up TX power strategy.

chrome/app/generated_resources.grd

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 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 11761 matching lines @@
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_PHONE_NOT_AUTHENTICATED" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when no phones eligible to unlock the Chromebook can be authenticated.">
         Unable to unlock. Enter your password.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_PHONE_LOCKED" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it's locked and thus not allowed to unlock the Chromebook.">
         Your phone is locked. Unlock it to enter.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_PHONE_UNLOCKABLE" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it does not have lock screen enabled, in which case it is not allowed to unlock Chromebooks.">
         To keep your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> safe, Smart Lock for Chromebook requires a screen lock on your phone.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_RSSI_TOO_LOW" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it's not in the Chromebook's proximity (> 30 feet away).">
-        Can’t find your phone. Make sure it’s within arm’s reach.
-      </message>
-      <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_TX_POWER_TOO_HIGH" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it's not in the Chromebook's proximity (> 1 foot away).">
         Bring your phone closer to your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> to enter.
       </message>
-      <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_PHONE_LOCKED_AND_TX_POWER_TOO_HIGH" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it's both (a) locked and (b) not in the Chromebook's proximity (> 1 foot away).">
+      <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_PHONE_LOCKED_AND_RSSI_TOO_LOW" desc="Tooltip for an icon on a user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected, but it's both (a) locked and (b) not in the Chromebook's proximity (> 1 foot away).">
         Unlock your phone and bring it closer to your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> to enter.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_INITIAL_AUTHENTICATED" desc="Tooltip text shown on lock screen when a phone eligible to unlock the Chromebook via Easy Unlock is detected and authenticated for the first time.">
         When your phone is unlocked and nearby, just click to enter. Otherwise, you’ll see a locked icon and need to type your password.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_HARDLOCK_INSTRUCTIONS" desc="Tooltip for an icon on user's lock screen pod shown by Easy Unlock when a phone eligible to unlock the Chromebook is detected and authenticated. The tooltip shows instructions for hard-locking the Chromebook.">
         If you click this icon, you will manually lock this <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph>. Next time, you’ll need to type your password to enter.
       </message>
       <message name="IDS_EASY_UNLOCK_SCREENLOCK_TOOLTIP_UNSUPPORTED_ANDROID_VERSION" desc="Tooltip for the icon on user's lock screen pod shown by Easy Unlock when a phone set up to unlock the Chromebook is detected, but has an unsupported Android version. The user is asked to update the phone.">
         Please update your phone to a newer version of Android to unlock this <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph>.
@@ skipping 530 matching lines @@
       Your downloads appear here
     </message>
 
     <!-- Automation info bar -->
     <message name="IDS_CONTROLLED_BY_AUTOMATION" desc="Message shown when the browser session is being controlled by an automated test.">
       Chrome is being controlled by automated test software.
     </message>
   </messages>
  </release>
 </grit>