[sdk] Remove source map scopes encoding/decoding code

This CL removes the now unused scopes encoding/decoding for the initial
encoding scheme of the "scopes" proposal.

[email protected]

Bug: 368222773
Change-Id: Icce82cf0885a1a4961317c74aded959651037cf7
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6797014
Reviewed-by: Philip Pfaffe <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>

Author: szuend

config/gni/devtools_grd_files.gni

@@ -949,7 +949,6 @@ grd_files_unbundled_sources = [
   "front_end/core/sdk/SourceMapFunctionRanges.js",
   "front_end/core/sdk/SourceMapManager.js",
   "front_end/core/sdk/SourceMapScopeChainEntry.js",
-  "front_end/core/sdk/SourceMapScopes.js",
   "front_end/core/sdk/SourceMapScopesInfo.js",
   "front_end/core/sdk/StorageBucketsModel.js",
   "front_end/core/sdk/StorageKeyManager.js",

front_end/core/sdk/BUILD.gn

@@ -82,7 +82,6 @@ devtools_module("sdk") {
     "SourceMapFunctionRanges.ts",
     "SourceMapManager.ts",
     "SourceMapScopeChainEntry.ts",
-    "SourceMapScopes.ts",
     "SourceMapScopesInfo.ts",
     "StorageBucketsModel.ts",
     "StorageKeyManager.ts",
@@ -177,7 +176,6 @@ ts_library("unittests") {
     "SourceMapFunctionRanges.test.ts",
     "SourceMapManager.test.ts",
     "SourceMapScopeChainEntry.test.ts",
-    "SourceMapScopes.test.ts",
     "SourceMapScopesInfo.test.ts",
     "StorageBucketsModel.test.ts",
     "StorageKeyManager.test.ts",

front_end/core/sdk/SourceMapFunctionRanges.ts

@@ -5,7 +5,6 @@
 import type * as ScopesCodec from '../../third_party/source-map-scopes-codec/source-map-scopes-codec.js';
 
 import {TokenIterator} from './SourceMap.js';
-import {comparePositions} from './SourceMapScopes.js';
 
 export interface NamedFunctionRange {
   start: ScopesCodec.Position;
@@ -150,3 +149,8 @@ export function decodePastaRanges(encodedRanges: string, names: string[]): Named
 
   return result;
 }
+
+/** @returns 0 if both positions are equal, a negative number if a < b and a positive number if a > b */
+function comparePositions(a: ScopesCodec.Position, b: ScopesCodec.Position): number {
+  return a.line - b.line || a.column - b.column;
+}