chrome/browser/resources/pdf/pdf_viewer_print.html

<style include="pdf-viewer-shared-style">
  viewer-page-indicator {
    opacity: 0;
    visibility: hidden;
    z-index: 2;
  }

  @media(max-height: 200px) {
    viewer-zoom-toolbar {
      display: none;
    }
  }

  @media(max-width: 300px) {
    viewer-zoom-toolbar {
      display: none;
    }
  }
</style>

<div id="sizer"></div>

<viewer-zoom-toolbar id="zoomToolbar"
    on-fit-to-changed="onFitToChanged"
    on-zoom-in="onZoomIn" on-zoom-out="onZoomOut">
</viewer-zoom-toolbar>

<viewer-page-indicator id="pageIndicator"></viewer-page-indicator>

<div id="content"></div>

<template is="dom-if" if="[[showErrorDialog]]">
  <viewer-error-dialog id="error-dialog"></viewer-error-dialog>
</template>