Changes in 20200503093615

Built from f6f3342609de2a98b6880facbb79a6eb43e3822a

..index..
Bug 1585078 R[Core:DOM: Navigation]Audit usage of nsIDocShellTreeItem in GetRootWindow
Bug 1634270 R[Core:DOM: Security]Fix rebase error from Bug 1623565 affecting MixedContentBlocker
Bug 1634829 R[Core:Graphics: WebGPU]webgpu color blending doesn't work
Bug 1634882 R[Core:JavaScript Engine: JIT]Fix missing Ion.h include in CacheIR.cpp
Bug 1634743 R[Core:Layout]Caret position on a block with only a ::before pseudo doesn't correctly account for line-height.
Bug 1633732 R[Core:Layout: Block and Inline]Intermittent first-letter/23605-5.html == first-letter/23605-5-ref.html | image comparison, max difference: 63, number of differing pixels: 1
Bug 1632420 R[Core:Layout: Form Controls]Intermittent table-anonymous-boxes/490174-1.html == table-anonymous-boxes/490174-1-ref.html | image comparison, max difference: 1, number of differing pixels: 2
Bug 1634834 R[Core:Layout: Text and Fonts]Webfont with 13-character ligature rejected by sanitizer
Bug 1619187 R[Core:Panning and Zooming]Pinch-to-zoom gesture on Google Maps affects the entire page instead of only the map with apz.allow_zooming=true
Bug 1634340 R[Firefox:Search]Add logging to search service for when a background update is received and happens
Bug 1625696 R[Firefox Build System:General]Intermittent autowinchecksec.py | Winchecksec returned error code -11:
Bug 1629429 R[Firefox Build System:Source Code Analysis]Poison.cpp: use unary 'static_assert' when the string literal is an empty string
Bug 1634605 R[Firefox Build System:Task Configuration]Stop retrying on apt-get errors
Bug 1634560 R[Firefox Build System:Toolchains]Perma subprocess.CalledProcessError: Command '['git', 'checkout', '--recurse-submodules', '8143f621359616f16eaa265e22d10a7962536634']' returned non-zero exit status 128.
Bug 1634865 R[Toolkit:Themes]Back out bug 1625720 and bug 1625721
Bug 1498706 R[WebExtensions:Untriaged]Intermittent browser/components/extensions/test/browser/browser_ext_port_disconnect_on_crash.js | Test timed out -
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Changes to 16 bugs - 15 fixed.