Remove the abstract BaseViewer-class

After the changes in PR 14112 the `PDFViewer`-class is now "identical" to the `BaseViewer`-class and the `PDFSinglePageViewer`-class is just a very thin wrapper around the `BaseViewer`-class.
Hence we can rename these files, and also remove the abstract `BaseViewer`-class, which helps reduce some unnecessary "closures" in the *built* viewer.

*Please note:* These changes are made in two separate commits, to allow GitHub to preserve `blame` for the affected files.

test/unit/clitests.json

@@ -9,7 +9,6 @@
     "annotation_spec.js",
     "annotation_storage_spec.js",
     "api_spec.js",
-    "base_viewer_spec.js",
     "bidi_spec.js",
     "cff_parser_spec.js",
     "cmap_spec.js",
@@ -35,6 +34,7 @@
     "pdf_find_controller_spec.js",
     "pdf_find_utils_spec.js",
     "pdf_history_spec.js",
+    "pdf_viewer_spec.js",
     "primitives_spec.js",
     "stream_spec.js",
     "struct_tree_spec.js",

test/unit/jasmine-boot.js

@@ -54,7 +54,6 @@ async function initializePDFJS(callback) {
       "pdfjs-test/unit/annotation_spec.js",
       "pdfjs-test/unit/annotation_storage_spec.js",
       "pdfjs-test/unit/api_spec.js",
-      "pdfjs-test/unit/base_viewer_spec.js",
       "pdfjs-test/unit/bidi_spec.js",
       "pdfjs-test/unit/cff_parser_spec.js",
       "pdfjs-test/unit/cmap_spec.js",
@@ -81,6 +80,7 @@ async function initializePDFJS(callback) {
       "pdfjs-test/unit/pdf_find_controller_spec.js",
       "pdfjs-test/unit/pdf_find_utils_spec.js",
       "pdfjs-test/unit/pdf_history_spec.js",
+      "pdfjs-test/unit/pdf_viewer_spec.js",
       "pdfjs-test/unit/primitives_spec.js",
       "pdfjs-test/unit/scripting_spec.js",
       "pdfjs-test/unit/stream_spec.js",

test/unit/pdf_viewer_spec.js

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { PDFPageViewBuffer } from "../../web/base_viewer.js";
+import { PDFPageViewBuffer } from "../../web/pdf_viewer.js";
 
 describe("PDFViewer", function () {
   describe("PDFPageViewBuffer", function () {

web/app.js

@@ -73,7 +73,7 @@ import { PDFScriptingManager } from "./pdf_scripting_manager.js";
 import { PDFSidebar } from "./pdf_sidebar.js";
 import { PDFSidebarResizer } from "./pdf_sidebar_resizer.js";
 import { PDFThumbnailViewer } from "./pdf_thumbnail_viewer.js";
-import { PDFViewer } from "./base_viewer.js";
+import { PDFViewer } from "./pdf_viewer.js";
 import { SecondaryToolbar } from "./secondary_toolbar.js";
 import { Toolbar } from "./toolbar.js";
 import { ViewHistory } from "./view_history.js";

web/pdf_single_page_viewer.js

@@ -14,7 +14,7 @@
  */
 
 import { ScrollMode, SpreadMode } from "./ui_utils.js";
-import { PDFViewer } from "./base_viewer.js";
+import { PDFViewer } from "./pdf_viewer.js";
 
 class PDFSinglePageViewer extends PDFViewer {
   _resetView() {

web/pdf_viewer.component.js

@@ -41,7 +41,7 @@ import { PDFHistory } from "./pdf_history.js";
 import { PDFPageView } from "./pdf_page_view.js";
 import { PDFScriptingManager } from "./pdf_scripting_manager.js";
 import { PDFSinglePageViewer } from "./pdf_single_page_viewer.js";
-import { PDFViewer } from "./base_viewer.js";
+import { PDFViewer } from "./pdf_viewer.js";
 import { StructTreeLayerBuilder } from "./struct_tree_layer_builder.js";
 import { TextLayerBuilder } from "./text_layer_builder.js";
 import { XfaLayerBuilder } from "./xfa_layer_builder.js";

web/secondary_toolbar.js

@@ -15,7 +15,7 @@
 
 import { ScrollMode, SpreadMode } from "./ui_utils.js";
 import { CursorTool } from "./pdf_cursor_tools.js";
-import { PagesCountLimit } from "./base_viewer.js";
+import { PagesCountLimit } from "./pdf_viewer.js";
 
 /**
  * @typedef {Object} SecondaryToolbarOptions