Fix radio button bug on sync_page.html

The second radio button in the passphrase section
was not visibly checked on selection.

To solve this, move the spans containing the conditional
strings inside one radio-button, instead off having two
conditional radio buttons.

Additional change:
 - Remove aria-label attribute because the visible text
   is used automatically as radio button title.

Bug: 894385
Change-Id: Ie339def905ca976444880166552ba580068b9271
Reviewed-on: https://chromium-review.googlesource.com/c/1276645Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599157}

chrome/browser/resources/settings/people_page/sync_page.html

@@ -455,25 +455,16 @@
                   aria-label="$i18n{encryptWithGoogleCredentialsLabel}">
                 $i18n{encryptWithGoogleCredentialsLabel}
               </cr-radio-button>
-              <template is="dom-if" if="[[syncPrefs.fullEncryptionBody]]">
-                <cr-radio-button name="encrypt-with-passphrase"
-                    class="list-item" disabled="[[syncPrefs.encryptAllData]]"
-                    aria-labelledby="fullEncryptionBody">
-                  <span id="fullEncryptionBody">
-                    [[syncPrefs.fullEncryptionBody]]
-                  </span>
-                </cr-radio-button>
-              </template>
-              <template is="dom-if" if="[[!syncPrefs.fullEncryptionBody]]">
-                <cr-radio-button name="encrypt-with-passphrase"
-                    class="list-item" disabled="[[syncPrefs.encryptAllData]]"
-                    aria-labelledby="encryptWithSyncPassphraseLabel">
-                  <span id="encryptWithSyncPassphraseLabel"
-                      on-click="onLearnMoreTap_">
-                    $i18nRaw{encryptWithSyncPassphraseLabel}
-                  </span>
-                </cr-radio-button>
-              </template>
+              <cr-radio-button name="encrypt-with-passphrase"
+                  class="list-item" disabled="[[syncPrefs.encryptAllData]]">
+                <span hidden="[[!syncPrefs.fullEncryptionBody]]">
+                  [[syncPrefs.fullEncryptionBody]]
+                </span>
+                <span on-click="onLearnMoreTap_"
+                    hidden="[[syncPrefs.fullEncryptionBody]]">
+                  $i18nRaw{encryptWithSyncPassphraseLabel}
+                </span>
+              </cr-radio-button>
             </paper-radio-group>
           </div>