Revert "update the repo references for package:file (#55906)"

This reverts commit 066a3c7.

DEPS

@@ -170,6 +170,7 @@ vars = {
   "upstream_dartdoc": "https://github.com/dart-lang/dartdoc.git",
   "upstream_equatable": "https://github.com/felangel/equatable.git",
   "upstream_ffi": "https://github.com/dart-lang/ffi.git",
+  "upstream_file": "https://github.com/google/file.dart.git",
   "upstream_fixnum": "https://github.com/dart-lang/fixnum.git",
   "upstream_flatbuffers": "https://github.com/google/flatbuffers.git",
   "upstream_freetype2": "https://gitlab.freedesktop.org/freetype/freetype.git",
@@ -386,6 +387,9 @@ deps = {
   'src/flutter/third_party/dart/third_party/pkg/dartdoc':
    Var('dart_git') + '/dartdoc.git@5df03dd913a0a2e20421cac61112aa84111160e0',
 
+  'src/flutter/third_party/dart/third_party/pkg/file':
+   Var('dart_git') + '/external/github.com/google/file.dart@6842feaef1c4e06239bd30f8d3ef722838b1c97e',
+
   'src/flutter/third_party/dart/third_party/pkg/fixnum':
    Var('dart_git') + '/fixnum.git@83293b8ed86ccd574a94fcf4a2da43f31c1b43e0',
 

pubspec.yaml

@@ -194,7 +194,7 @@ dependency_overrides:
   expect:
     path: ./third_party/dart/pkg/expect
   file:
-    path: ./third_party/dart/third_party/pkg/tools/pkgs/file
+    path: ./third_party/dart/third_party/pkg/file/packages/file
   ffi:
     path: ./third_party/dart/third_party/pkg/native/pkgs/ffi
   fixnum:

web_sdk/pubspec.yaml

@@ -33,7 +33,7 @@ dependency_overrides: # Must include all transitive dependencies from the "any"
   dart_internal:
     path: ../third_party/dart/pkg/dart_internal
   file:
-    path: ../third_party/dart/third_party/pkg/tools/pkgs/file
+    path: ../third_party/dart/third_party/pkg/file/packages/file
   glob:
     path: ../third_party/dart/third_party/pkg/glob
   macros: