Previously, —unoptimized builds on Android would include debug symbols but still would be optimized. This killed the experience in the debugger on Android.

* Remove references to unused GN files and flags.
* Fix Linux build.

https://github.com/flutter/flutter/issues/4866

Was only used by the buildbot to test that the armv7 precompiler paths built. The Android AOTC variants check that now.

Change the "develop" runtime mode back to "debug" and rename the "debug" build configuration to "unoptimized" (#2669)

Remove the use of --simulator to indicate x64 on Android

These build definitions no longer work with the current version of FNL. Once
FNL is ready, we'll add new build definitions that work for it again.

This include build system changes for selecting Dart's precompiler mode
plus a way to locate and load the precompiled snapshot library from an
Android application

This allows us to create a separate buildbot target.

This flag makes it easier to enable the glfw configuration.

Also, fix an unrelated build error in loader.cc.

We had switched to libjpeg, but libjpeg was failing to decode images when
built with the defines in our .gn files

We don't use yasm, libjpeg_turbo, or mojo's devtools.

Also fixed missing dependency from LocalDOMWindow.cpp on
mojo's navigation service.  Not sure why gn check missed that.

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