Remove build rules for spvc support & spirv-cross fuzzers

Disabling this while refactoring how dependencies are set up to avoid
breaking various builds and rolls.

BUG=dawn:285

Change-Id: Iaca2614fb73277a1ea850f90a487693cd4c54fcb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/14040
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

BUILD.gn

@@ -128,10 +128,6 @@ source_set("libdawn_native_sources") {
     "third_party:spirv_cross",
   ]
   defines = []
-  if (dawn_use_spvc) {
-    deps += [ "${dawn_shaderc_dir}:libshaderc_spvc" ]
-    defines += [ "DAWN_USE_SPVC" ]
-  }
 
   configs += [ ":libdawn_native_internal" ]
   libs = []
@@ -1197,9 +1193,6 @@ if (dawn_standalone) {
 group("dawn_fuzzers") {
   testonly = true
   deps = [
-    "src/fuzzers:dawn_spirv_cross_glsl_fast_fuzzer",
-    "src/fuzzers:dawn_spirv_cross_hlsl_fast_fuzzer",
-    "src/fuzzers:dawn_spirv_cross_msl_fast_fuzzer",
     "src/fuzzers:dawn_wire_server_and_frontend_fuzzer",
   ]
 }

build_overrides/shaderc.gni

@@ -16,5 +16,3 @@ shaderc_glslang_dir = "//third_party/glslang"
 shaderc_spirv_tools_dir = "//third_party/SPIRV-Tools"
 shaderc_spirv_cross_dir = "//third_party"
 shaderc_spirv_headers_dir = "//third_party/spirv-headers"
-
-shaderc_enable_spvc_parser = false

scripts/dawn_features.gni

@@ -44,10 +44,6 @@ declare_args() {
   # GLSL/HLSL/MSL compiler. This implicitly pulls in the GLSL
   # compiler, since it is a sub-class of if.
   dawn_enable_cross_reflection = false
-
-  # Enables using spvc for accessing SPIR-V toolchain, instead of
-  # directly accessing it in Dawn.
-  dawn_use_spvc = false
 }
 
 # GN does not allow reading a variable defined in the same declare_args().

src/fuzzers/BUILD.gn

@@ -69,55 +69,6 @@ if (build_with_chromium) {
   }
 }
 
-static_library("dawn_spirv_cross_fuzzer_common") {
-  sources = [
-    "DawnSPIRVCrossFuzzer.cpp",
-    "DawnSPIRVCrossFuzzer.h",
-  ]
-  public_deps = [
-    "${dawn_shaderc_dir}:libshaderc_spvc",
-  ]
-}
-
-# TODO(rharrison): Remove asan_options once signal trap is no longer
-#                  needed.
-# Uses Dawn specific options and varies input data
-dawn_fuzzer_test("dawn_spirv_cross_glsl_fast_fuzzer") {
-  sources = [
-    "DawnSPIRVCrossGLSLFastFuzzer.cpp",
-  ]
-  deps = [
-    ":dawn_spirv_cross_fuzzer_common",
-  ]
-  asan_options = [ "allow_user_segv_handler=1" ]
-}
-
-# TODO(rharrison): Remove asan_options once signal trap is no longer
-#                  needed.
-# Uses Dawn specific options and varies input data
-dawn_fuzzer_test("dawn_spirv_cross_hlsl_fast_fuzzer") {
-  sources = [
-    "DawnSPIRVCrossHLSLFastFuzzer.cpp",
-  ]
-  deps = [
-    ":dawn_spirv_cross_fuzzer_common",
-  ]
-  asan_options = [ "allow_user_segv_handler=1" ]
-}
-
-# TODO(rharrison): Remove asan_options once signal trap is no longer
-#                  needed.
-# Uses Dawn specific options and varies input data
-dawn_fuzzer_test("dawn_spirv_cross_msl_fast_fuzzer") {
-  sources = [
-    "DawnSPIRVCrossMSLFastFuzzer.cpp",
-  ]
-  deps = [
-    ":dawn_spirv_cross_fuzzer_common",
-  ]
-  asan_options = [ "allow_user_segv_handler=1" ]
-}
-
 dawn_fuzzer_test("dawn_wire_server_and_frontend_fuzzer") {
   sources = [
     "DawnWireServerAndFrontendFuzzer.cpp",

third_party/BUILD.gn

@@ -66,9 +66,8 @@ static_library("spirv_cross") {
     "${spirv_cross_dir}/spirv_parser.hpp",
   ]
 
-  need_glsl_cross =
-      dawn_enable_opengl || dawn_enable_cross_reflection || dawn_use_spvc
-  need_reflection_cross = dawn_enable_cross_reflection || dawn_use_spvc
+  need_glsl_cross = dawn_enable_opengl || dawn_enable_cross_reflection
+  need_reflection_cross = dawn_enable_cross_reflection
 
   if (dawn_enable_d3d12) {
     sources += [