This reverts commit 04ea3183.

This reverts commit e768c92f.

* Update packages.

* Add many more global analyses.

* Catch trailing spaces and trailing newlines in all text files.
  Before we were only checking newly added files, but that means we
  missed some.

* Port the trailing spaces logic to work on Windows too.

* Correct all the files with trailing spaces and newlines.

* Refactor some of the dev/bots logic into a utils.dart library.
  Notably, the "exit" and "print" shims for testing are now usable
  from test.dart, analyze.dart, and run_command.dart.

* Add an "exitWithError" function that prints the red lines and
  then exits. This is the preferred way to exit from test.dart,
  analyze.dart, and run_command.dart.

* More consistency in the output of analyze.dart.

* Refactor analyze.dart to use the _allFiles file enumerating logic
  more widely.

* Add some double-checking logic to the _allFiles logic to catch
  cases where changes to that logic end up catching fewer files
  than expected (helps prevent future false positives).

* Add a check to prevent new binary files from being added to
  the repository. Grandfather in the binaries that we've already
  added.

* Update all the dependencies (needed because we now import crypto in
  dev/bots/analyze.dart).

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

This reverts commit 421bf647.

Was causing severe breakages in Google.

Update the Slider and RangeSlider to the latest Material spec. This introduces an updated track, updated thumbs, updated tick marks, and a new value indicator shape. The old paddle value indicator shape is also updated so that text scaling works consistently.

* Updates to slider_test.dart

Fixed error that required onChanged.

* Updated slider.dart and slider_test.dart debugFillProperties

Updated slider.dart debugFillProperties to include all properties and slider_test debugFillProperties to test all properties

* Updated Slider onChanged property

* Updated debugFillProperties to ignore testing methods that are null in test

Per feedback from Hans/Anthony on Flutter Material

* Updated spacing in debugFillProperties

Per feedback from Hans

* Updated range_slider.dart and range_slider_test.dart to have DiagnosticProperties tests for all properties

* Updated range_slider.dart and range_slider_test.dart per feedback

Preventing null labels from creating an error.

Added made RangeLabels and RangeValues constants in instantiation of Range Slider.

Fixed spacing.

* Updates to start and end labels in diagnostic property tests

Updated per feedback from @clocksmith

[Material] Text scale and wide label fixes for Slider and Range Slider value indicator shape (#35496)

Various bug fixes for Slider and Range Slider value indicator around accessibility and wide labels.

Fixes a bug in the Range Sider where the onChangeStart and onChangeEnd were not being called if the initial thumb selection came from a drag (rather than a tap).

Creates a Material Design range slider.

The range slider is based off the updated slider, with the main difference being that it has 2 thumbs.
By default, the thumbs cannot pass each other and both the thumb and the value indicator create a stroke when they are overlapping for better visibility.