[api-minor] Stop exposing the createObjectURL helper function in the API

With recent changes, specifically PR 14515 *and* the previous patch, the `createObjectURL` helper function is now only used with the SVG back-end.
All other call-sites, throughout the code-base, are now using `URL.createObjectURL(...)` directly and it no longer seems necessary to keep exposing the helper function in the API.
Finally, the `createObjectURL` helper function is moved into the `src/display/svg.js` file to avoid unnecessarily duplicating this code on both the main- and worker-threads.

src/display/svg.js

@@ -15,7 +15,6 @@
 /* globals __non_webpack_require__ */
 
 import {
-  createObjectURL,
   FONT_IDENTITY_MATRIX,
   IDENTITY_MATRIX,
   ImageKind,
@@ -50,6 +49,36 @@ if (
   const LINE_CAP_STYLES = ["butt", "round", "square"];
   const LINE_JOIN_STYLES = ["miter", "round", "bevel"];
 
+  const createObjectURL = function (
+    data,
+    contentType = "",
+    forceDataSchema = false
+  ) {
+    if (
+      URL.createObjectURL &&
+      typeof Blob !== "undefined" &&
+      !forceDataSchema
+    ) {
+      return URL.createObjectURL(new Blob([data], { type: contentType }));
+    }
+    // Blob/createObjectURL is not available, falling back to data schema.
+    const digits =
+      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+    let buffer = `data:${contentType};base64,`;
+    for (let i = 0, ii = data.length; i < ii; i += 3) {
+      const b1 = data[i] & 0xff;
+      const b2 = data[i + 1] & 0xff;
+      const b3 = data[i + 2] & 0xff;
+      const d1 = b1 >> 2,
+        d2 = ((b1 & 3) << 4) | (b2 >> 4);
+      const d3 = i + 1 < ii ? ((b2 & 0xf) << 2) | (b3 >> 6) : 64;
+      const d4 = i + 2 < ii ? b3 & 0x3f : 64;
+      buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
+    }
+    return buffer;
+  };
+
   const convertImgDataToPng = (function () {
     const PNG_HEADER = new Uint8Array([
       0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,

src/pdf.js

@@ -23,7 +23,6 @@
 import {
   AnnotationMode,
   CMapCompressionType,
-  createObjectURL,
   createPromiseCapability,
   createValidAbsoluteUrl,
   InvalidPDFException,
@@ -109,7 +108,6 @@ export {
   AnnotationMode,
   build,
   CMapCompressionType,
-  createObjectURL,
   createPromiseCapability,
   createValidAbsoluteUrl,
   getDocument,

src/shared/util.js

@@ -1109,28 +1109,6 @@ function createPromiseCapability() {
   return capability;
 }
 
-function createObjectURL(data, contentType = "", forceDataSchema = false) {
-  if (URL.createObjectURL && typeof Blob !== "undefined" && !forceDataSchema) {
-    return URL.createObjectURL(new Blob([data], { type: contentType }));
-  }
-  // Blob/createObjectURL is not available, falling back to data schema.
-  const digits =
-    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
-
-  let buffer = `data:${contentType};base64,`;
-  for (let i = 0, ii = data.length; i < ii; i += 3) {
-    const b1 = data[i] & 0xff;
-    const b2 = data[i + 1] & 0xff;
-    const b3 = data[i + 2] & 0xff;
-    const d1 = b1 >> 2,
-      d2 = ((b1 & 3) << 4) | (b2 >> 4);
-    const d3 = i + 1 < ii ? ((b2 & 0xf) << 2) | (b3 >> 6) : 64;
-    const d4 = i + 2 < ii ? b3 & 0x3f : 64;
-    buffer += digits[d1] + digits[d2] + digits[d3] + digits[d4];
-  }
-  return buffer;
-}
-
 export {
   AbortException,
   AnnotationActionEventType,
@@ -1149,7 +1127,6 @@ export {
   BaseException,
   bytesToString,
   CMapCompressionType,
-  createObjectURL,
   createPromiseCapability,
   createValidAbsoluteUrl,
   DocumentActionEventType,