React sync for revisions d836010...4773fdf

Summary:
@public
This sync includes the following changes:
- **[4773fdf7c](facebook/react@4773fdf7c)**: Deprecate findDOMNode in StrictMode (#13841) //<Sebastian Markbåge>//
- **[c9be16f5b](facebook/react@c9be16f5b)**: [scheduler] Rename priority levels (#13842) //<Andrew Clark>//
- **[3b7ee2692](facebook/react@3b7ee2692)**: Deprecate context object as a consumer and add a warning message (#13829) //<Dominic Gannaway>//
- **[8ca8a594e](facebook/react@8ca8a594e)**: Error gracefully for unsupported SSR features (#13839) //<Dan Abramov>//
- **[4a635785f](facebook/react@4a635785f)**: Fix User Timing oddities with Suspense, pure, and lazy (#13833) //<Dan Abramov>//
- **[a165cf747](facebook/react@a165cf747)**: Renamed 4 Internal React Modules //<Nadia Osipova>//
- **[a68ca9a5b](facebook/react@a68ca9a5b)**: React.pure automatically forwards ref (#13822) //<Sophie Alpert>//
- **[c73497c3c](facebook/react@c73497c3c)**: Update bundle sizes for 16.6.0-alpha.8af6728 release //<Dan Abramov>//
- **[1a57dc668](facebook/react@1a57dc668)**: Updating dependencies for react-noop-renderer //<Dan Abramov>//
- **[77f8dfd81](facebook/react@77f8dfd81)**: Updating package versions for release 16.6.0-alpha.8af6728 //<Dan Abramov>//
- **[8af6728c6](facebook/react@8af6728c6)**: Enable Suspense + rename Placeholder (#13799) //<Dan Abramov>//
- **[f47a958ea](facebook/react@f47a958ea)**: Don’t add onclick listener to React root (#13778) //<Philipp>//
- **[b2cea9078](facebook/react@b2cea9078)**: [scheduler] Eagerly schedule rAF at beginning of frame (#13785) //<Andrew Clark>//
- **[e2e7cb9f4](facebook/react@e2e7cb9f4)**: [scheduler] add a test documenting current behavior (#13687) //<plievone>//

Release Notes:
[GENERAL] [FEATURE] [React] - React sync for revisions d836010...4773fdf

Reviewed By: acdlite

Differential Revision: D10350869

fbshipit-source-id: ea8ad4b5d914c870be1fc80aa1005b224d37f5e5

Author: yungsters

Libraries/Renderer/REVISION

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