Move binarySearchFirstItem back to the web/-folder (PR 15237 follow-up)

This was moved into the `src/display/`-folder in PR 15110, for the initial editor-a11y patch. However, with the changes in PR 15237 we're again only using `binarySearchFirstItem` in the `web/`-folder and it thus seem reasonable to move it back there.
The primary reason for moving it back is that `binarySearchFirstItem` is currently exposed in the public API, and we always want to avoid that unless it's either PDF-related functionality or code that simply must be shared between the `src/`- and `web/`-folders. In this case, `binarySearchFirstItem` is a general helper function that doesn't really satisfy either of those alternatives.

src/display/display_utils.js

@@ -611,38 +611,6 @@ function getColorValues(colors) {
   span.remove();
 }
 
-/**
- * Use binary search to find the index of the first item in a given array which
- * passes a given condition. The items are expected to be sorted in the sense
- * that if the condition is true for one item in the array, then it is also true
- * for all following items.
- *
- * @returns {number} Index of the first array element to pass the test,
- *                   or |items.length| if no such element exists.
- */
-function binarySearchFirstItem(items, condition, start = 0) {
-  let minIndex = start;
-  let maxIndex = items.length - 1;
-
-  if (maxIndex < 0 || !condition(items[maxIndex])) {
-    return items.length;
-  }
-  if (condition(items[minIndex])) {
-    return minIndex;
-  }
-
-  while (minIndex < maxIndex) {
-    const currentIndex = (minIndex + maxIndex) >> 1;
-    const currentItem = items[currentIndex];
-    if (condition(currentItem)) {
-      maxIndex = currentIndex;
-    } else {
-      minIndex = currentIndex + 1;
-    }
-  }
-  return minIndex; /* === maxIndex */
-}
-
 function getCurrentTransform(ctx) {
   const { a, b, c, d, e, f } = ctx.getTransform();
   return [a, b, c, d, e, f];
@@ -655,7 +623,6 @@ function getCurrentTransformInverse(ctx) {
 
 export {
   AnnotationPrefix,
-  binarySearchFirstItem,
   deprecated,
   DOMCanvasFactory,
   DOMCMapReaderFactory,

src/pdf.js

@@ -41,7 +41,15 @@ import {
   VerbosityLevel,
 } from "./shared/util.js";
 import {
-  binarySearchFirstItem,
+  build,
+  getDocument,
+  LoopbackPort,
+  PDFDataRangeTransport,
+  PDFWorker,
+  setPDFNetworkStreamFactory,
+  version,
+} from "./display/api.js";
+import {
   getFilenameFromUrl,
   getPdfFilenameFromUrl,
   getXfaPageViewport,
@@ -52,15 +60,6 @@ import {
   PixelsPerInch,
   RenderingCancelledException,
 } from "./display/display_utils.js";
-import {
-  build,
-  getDocument,
-  LoopbackPort,
-  PDFDataRangeTransport,
-  PDFWorker,
-  setPDFNetworkStreamFactory,
-  version,
-} from "./display/api.js";
 import { AnnotationEditorLayer } from "./display/editor/annotation_editor_layer.js";
 import { AnnotationEditorUIManager } from "./display/editor/tools.js";
 import { AnnotationLayer } from "./display/annotation_layer.js";
@@ -117,7 +116,6 @@ export {
   AnnotationEditorUIManager,
   AnnotationLayer,
   AnnotationMode,
-  binarySearchFirstItem,
   build,
   CMapCompressionType,
   createPromiseCapability,