[MD settings] remove blank floating label from manage people page

This CL avoids a nbsp that was holding space for a paper-input label.
The no-label-float was used to tell paper-input not to reserve the space.

Bug: 746207
Change-Id: Id05d33c74ca9f68b54b26e4afe66a3874161ce93
Reviewed-on: https://chromium-review.googlesource.com/578134Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488072}

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

@@ -19,9 +19,9 @@
     </style>
     <div class="settings-box first">
       <paper-input id="name" value="[[profileName]]" pattern=".*\S.*"
-          auto-validate required on-change="onProfileNameChanged_"
-          on-keydown="onProfileNameKeydown_"
-          disabled="[[isProfileNameDisabled_(syncStatus)]]">
+          on-change="onProfileNameChanged_" on-keydown="onProfileNameKeydown_"
+          disabled="[[isProfileNameDisabled_(syncStatus)]]"
+          auto-validate no-label-float required>
       </paper-input>
     </div>
     <template is="dom-if" if="[[isProfileShortcutSettingVisible_]]">