test: drop PDF tests (#2744)

We fully rely on upstream PDF functionality. Our PDF tests are inferior
to those upstream and inconvenient to write.

test/utils.js

@@ -81,37 +81,4 @@ const utils = module.exports = {
   waitEvent: function(emitter, eventName) {
     return new Promise(fulfill => emitter.once(eventName, fulfill));
   },
-
-  /**
-  * @param {!Buffer} pdfBuffer
-  * @return {!Promise<!Array<!Object>>}
-  */
-  getPDFPages: async function(pdfBuffer) {
-    const PDFJS = require('pdfjs-dist');
-    PDFJS.disableWorker = true;
-    const data = new Uint8Array(pdfBuffer);
-    const doc = await PDFJS.getDocument(data);
-    const pages = [];
-    for (let i = 0; i < doc.numPages; ++i) {
-      const page = await doc.getPage(i + 1);
-      const viewport = page.getViewport(1);
-      // Viewport width and height is in PDF points, which is
-      // 1/72 of an inch.
-      pages.push({
-        width: viewport.width / 72,
-        height: viewport.height / 72,
-      });
-      page.cleanup();
-    }
-    doc.cleanup();
-    return pages;
-  },
-
-  /**
-   * @param {number} px
-   * @return {number}
-   */
-  cssPixelsToInches: function(px) {
-    return px / 96;
-  },
 };