Changes in 20210701101609

Built from b02bf2c73016ec5628e082d342b4678e37f4cee3

..index..
Bug 1714914 R[Core:DOM: Editor]Stop using `int32_t` for offset in parent node in editor module
Bug 1717185 R[Core:DOM: Networking]TCPSocket.send incorrectly returns true because mBufferedAmount is not updated in time
Bug 1718607 R[Core:Spelling checker]Stop using `int32_t` for offset in parent node in TextServicesDocument
Bug 1716834 R[Firefox Build System:General]Perma [tier2] /builds/worker/checkouts/gecko/netwerk/protocol/http/HttpWinUtils.cpp:8:10: fatal error: 'proofofpossessioncookieinfo.h' file not found
Bug 1714465 R[Toolkit:Crash Reporting]Teach breakpad to populate ThreadNamesStream on Linux
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Changes to 5 bugs - 5 fixed.