media: Update text on "protected content" permission on Android

See Bug for discussions on the new text.

Note that I am not adding a trailing dot/period to the new text because
even if I do, it'll be stripped and not showing up in the actual
permission prompt.

Bug: 721969
Test: Manually tested and inspected the new prompt.
Change-Id: I609512b11991354bdb8954f3e63c6ac157f17927
Reviewed-on: https://chromium-review.googlesource.com/996769Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549661}

chrome/app/generated_resources.grd

@@ -9113,7 +9113,7 @@ Please help our engineers fix this problem. Tell us what happened right before y
           Know your unique device identifier
         </message>
         <message name="IDS_PROTECTED_MEDIA_IDENTIFIER_INFOBAR_TEXT" desc="Text requesting permission for a site to access protected media identifier. It shows the origin of the URL.">
-          <ph name="URL">$1<ex>https://www.youtube.com</ex></ph> wants to uniquely identify your device to play protected content
+          <ph name="URL">$1<ex>https://www.youtube.com</ex></ph> wants to play protected content. Your device’s identity will be verified by Google
         </message>
       </if>
       <message name="IDS_MANAGE_PASSWORDS_CONFIRM_GENERATED_TEXT" desc="A message that the browser shows after saving a password it has autogenerated for the user. This message appears in a bubble and contains a link to all the user's saved autogenerated passwords. The link text is a separate string in the translation console and appears here as placeholder text.">