Changes in 20191227094418

Built from 264003682fbf25a121deeeb305d206a7cd437b94

..index..
Bug 1605798 R[Core:Audio/Video: Playback]Some clean up in MediaControlService
Bug 1606019 R[Core:CSS Parsing and Computation]Remove some useless code to refcount nsIReferrerInfo from rust.
Bug 1601703 R[Core:Canvas: WebGL]Crash in [@ gl::Program::getInfoLogLength]
Bug 1604622 R[Core:Canvas: WebGL]webgl_gpgpu_protoplanet broken on Android (RGBA32F not renderable?)
Bug 1601322 R[Core:DOM: Animation]Intermittent /web-animations/timing-model/animations/reverse-running-animation.html | Testing http://web-platform.test:8000/web-animations/timing-model/animations/reverse-running-animation.html == http://web-platform.test:8000/web-animations/timing-model
Bug 1605380 R[Core:Graphics: WebRender]Avoid calculating snapped bounds for some display items twice
Bug 1604535 R[Core:ImageLib]Crash in [@ OOM | large | mozalloc_abort | mozalloc_handle_oom | moz_xmalloc | mozilla::gfx::SourceSurfaceRawData::GuaranteePersistance]
Bug 1134069 R[Core:Layout: Ruby]Submit appropriate CSS Ruby tests to W3C test suite
Bug 1599337 R[Core:Memory Allocator]Disable PHC on late beta 72 builds
Bug 1605867 R[Core:Security: Process Sandboxing]Improve performance when failing to launch sandboxed process.
Bug 1602526 R[Core:Spelling checker]Spellcheck broken for words with "Umlaute" in some text editors
Bug 1601697 R[DevTools:Performance Tools (Profiler/Timeline)]Add mochitests for configuring settings in about:profiling
Bug 1559975 N[Firefox Build System:General]Fix python3 source compatibility
Bug 1606009 R[Firefox Build System:Lint and Formatting]update yamllint to 1.20.0 + fix test
Bug 1605664 R[Firefox Build System:Source Code Analysis]WebRenderBridgeParent.cpp: redundant return statement at the end of a function with a void return type
Bug 1605661 R[Firefox Build System:Source Code Analysis]nsDOMNavigationTiming.cpp: redundant return statement at the end of a function with a void return type
Bug 1605662 R[Firefox Build System:Source Code Analysis]CustomElementRegistry.cpp: redundant return statement at the end of a function with a void return type
Bug 1604606 R[Firefox Build System:Source Code Analysis]crashreporter_gtk_common.{h,cpp}: redundant 'SaveSettings' declaration
Bug 1605991 R[GeckoView:General]Crashes on some sites with a web manifest
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Changes to 19 bugs - 18 fixed.