[build] Remove Fuchsia sub-builds.

The builders at https://ci.chromium.org/p/fuchsia/g/dart/console no longer exist.

TEST=build
Change-Id: I1b801d7892b3e6cba37d7b9549e3d08306cc9723
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/417907
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>

runtime/BUILD.gn

@@ -121,13 +121,6 @@ config("dart_os_config") {
   }
 }
 
-# We need to build gen_snapshot targeting Fuchsia during a build of the SDK
-# targeting Mac and Linux. This configuration is used to unconditionally target
-# Fuchsia. It should not be combined with dart_os_config.
-config("dart_os_fuchsia_config") {
-  defines = [ "DART_TARGET_OS_FUCHSIA" ]
-}
-
 # We need to build gen_snapshot targeting Linux ARM64 during a build
 # of the SDK. This configuration is used to unconditionally target
 # Linux ARM64. It should not be combined with dart_os_config and dart_arch_config.

runtime/bin/BUILD.gn

@@ -85,20 +85,6 @@ build_libdart_builtin("libdart_builtin_product") {
   ]
 }
 
-build_libdart_builtin("libdart_builtin_fuchsia") {
-  extra_configs = [
-    "..:dart_maybe_product_config",
-    "..:dart_os_fuchsia_config",
-  ]
-}
-
-build_libdart_builtin("libdart_builtin_product_fuchsia") {
-  extra_configs = [
-    "..:dart_product_config",
-    "..:dart_os_fuchsia_config",
-  ]
-}
-
 build_libdart_builtin("libdart_builtin_host_targeting_host") {
   extra_configs = [ "..:dart_maybe_product_config" ]
 }
@@ -316,34 +302,6 @@ build_gen_snapshot("gen_snapshot_product") {
   ]
 }
 
-build_gen_snapshot("gen_snapshot_fuchsia") {
-  extra_configs = [
-    "..:dart_maybe_product_config",
-    "..:dart_arch_config",
-    "..:dart_os_fuchsia_config",
-  ]
-  extra_deps = [
-    ":gen_snapshot_dart_io_fuchsia",
-    ":libdart_builtin_fuchsia",
-    "..:libdart_precompiler_fuchsia",
-    "../platform:libdart_platform_precompiler_fuchsia",
-  ]
-}
-
-build_gen_snapshot("gen_snapshot_product_fuchsia") {
-  extra_configs = [
-    "..:dart_product_config",
-    "..:dart_arch_config",
-    "..:dart_os_fuchsia_config",
-  ]
-  extra_deps = [
-    ":gen_snapshot_dart_io_product_fuchsia",
-    ":libdart_builtin_product_fuchsia",
-    "..:libdart_precompiler_product_fuchsia",
-    "../platform:libdart_platform_precompiler_product_fuchsia",
-  ]
-}
-
 build_gen_snapshot("gen_snapshot_product_linux_x64") {
   extra_configs = [
     "..:dart_product_config",
@@ -457,22 +415,6 @@ build_gen_snapshot_dart_io("gen_snapshot_dart_io_product_host_targeting_host") {
   extra_configs = [ "..:dart_product_config" ]
 }
 
-build_gen_snapshot_dart_io("gen_snapshot_dart_io_fuchsia") {
-  extra_configs = [
-    "..:dart_maybe_product_config",
-    "..:dart_arch_config",
-    "..:dart_os_fuchsia_config",
-  ]
-}
-
-build_gen_snapshot_dart_io("gen_snapshot_dart_io_product_fuchsia") {
-  extra_configs = [
-    "..:dart_product_config",
-    "..:dart_arch_config",
-    "..:dart_os_fuchsia_config",
-  ]
-}
-
 build_gen_snapshot_dart_io("gen_snapshot_dart_io_product_linux_x64") {
   extra_configs = [
     "..:dart_product_config",

runtime/configs.gni

@@ -12,12 +12,6 @@ _base_config = [
   "$_dart_runtime:dart_os_config",
 ]
 
-_base_fuchsia_config = [
-  "$_dart_runtime:dart_arch_config",
-  "$_dart_runtime:dart_config",
-  "$_dart_runtime:dart_os_fuchsia_config",
-]
-
 _base_host_targeting_host_config = [ "$_dart_runtime:dart_config" ]
 
 _maybe_product = [ "$_dart_runtime:dart_maybe_product_config" ]
@@ -51,12 +45,6 @@ _precompiler_testing_config =
 
 _precompiler_product_config = _base_config + _precompiler_base + _product
 
-_precompiler_fuchsia_config =
-    _base_fuchsia_config + _precompiler_base + _maybe_product
-
-_precompiler_product_fuchsia_config =
-    _base_fuchsia_config + _precompiler_base + _product
-
 _precompiler_host_targeting_host_config =
     _base_host_targeting_host_config + _precompiler_base + _maybe_product
 
@@ -125,20 +113,6 @@ _all_configs = [
     compiler = true
     is_product = true
   },
-  {
-    suffix = "_precompiler_fuchsia"
-    configs = _precompiler_fuchsia_config
-    snapshot = false
-    compiler = true
-    is_product = false
-  },
-  {
-    suffix = "_precompiler_product_fuchsia"
-    configs = _precompiler_product_fuchsia_config
-    snapshot = false
-    compiler = true
-    is_product = true
-  },
   {
     suffix = "_precompiler_host_targeting_host"
     configs = _precompiler_host_targeting_host_config