* 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
* Track number of package dependencies in Flutter
Relands #20774.
* Use evalFlutter instead of startProcess.
That way we don't need `flutter` on the PATH.
* Revert "Deprecated CupertinoDialog in favor of a new widget called CupertinoP… (#20649)"
This reverts commit 3a4ae280e3.
* Revert "Feature pesto new recipes (#19415)"
This reverts commit e2f3b3d6f2.
* Revert "Use markdown table (#20721)"
This reverts commit 82d43b952a.
* Revert "Documentation regarding tap gesture callbacks (#20647)"
This reverts commit 3acc278521.
* Revert "Add branch to footer information in flutter docs (#20711)"
This reverts commit 9118d3d715.
* Revert "Performance test cleanup (#20652)"
This reverts commit 1993a67381.
* Revert "Track number of package dependencies in Flutter (#20722)"
This reverts commit 03d6f18f4a.
* Roll engine to b6df7a637498ca9beda1fa9cd7210e3202ea599f.
Changes since last roll:
```
b6df7a637 Roll dart to 290c576264faa096a0b3206c71b2435309d9f904. (#4771)
a6764dbd5 Add sources for Fuchsia target. (#4763)
2d5900615 [fuchsia] Remove unused header file. (#4769)
9717063b7 Revert "Roll dart to c080951d45e79cd25df98036c4be835b284a269c. (#4767)" (#4768)
9a9814312 Roll dart to c080951d45e79cd25df98036c4be835b284a269c. (#4767)
e74e8b35c [async] Update includes of async headers to new path (#4760)
e2c4b2760 Use Dart 2 camel case constants in the engine Dart libraries (#4766)
9c1e48434 Updates for Fuchsia roll. (#4765)
14c940e27 Switch from fxl::Mutex to std::mutex (#4764)
debf82c0b Roll Garnet (#4759)
5bffdefbb Use weak pointers to the accesibility bridge from objects vended to the UIKit accessibility framework. (#4761)
```
Turns out MacOS has a really low open files limit and so if you try to
open EVERY FILE AT THE SAME TIME it falls over.
This just opens the files one at a time, the way we used to back in
the old days.
