Revert "Add scaffolding for structured GPU command buffer fuzzer"

This reverts commit 8afc180.

Reason for revert: broke build on GPU FYI Win x64 debug builder:
https://ci.chromium.org/p/chromium/builders/ci/GPU%20FYI%20Win%20x64%20Builder%20(dbg)/13152?blamelist=1#blamelist-tab

Original change's description:
> Add scaffolding for structured GPU command buffer fuzzer
> 
> This CL contains a basic fuzzer for WebGL shaders that shows some
> essential design ideas:
> 
> 1) a protobuf spec defines how shaders will be generated
> 2) conversion from protobuf message to shader string is
>    provided in its own library that has unit tests
> 3) we add a basic fuzzer to compile shader programs using libANGLE
> 
> This is by no means complete and serves as a foundation for the fuzzer
> so subsequent CLs will be easier to review. Later CLs will slowly complete
> the core grammar for GLSL before incorporating some more complex testcases
> from the Khronos compliance suite.
> 
> BUG=900487
> 
> Change-Id: I67df52a73926d22637afad9a966790f34011175c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623556
> Commit-Queue: Ned Williamson <nedwill@google.com>
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#662832}

TBR=pkasting@chromium.org,kbr@chromium.org,piman@chromium.org,xyzzyz@chromium.org,nedwill@google.com

Change-Id: I91debbc67cebc46ecdcaa06b6b1cf587fae781f1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 900487
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627825
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662929}

gpu/BUILD.gn

@@ -6,7 +6,6 @@ import("//build/config/jumbo.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
-import("//third_party/protobuf/proto_library.gni")
 import("//ui/gl/features.gni")
 
 config("gpu_implementation") {
@@ -197,68 +196,6 @@ jumbo_static_library("test_support") {
   ]
 }
 
-if (!is_android && !is_fuchsia) {
-  proto_library("gl_lpm_fuzzer_proto") {
-    sources = [
-      "command_buffer/tests/lpm/gl_lpm_fuzzer.proto",
-    ]
-  }
-
-  static_library("gl_lpm_shader_to_string") {
-    sources = [
-      "command_buffer/tests/lpm/gl_lpm_shader_to_string.cc",
-      "command_buffer/tests/lpm/gl_lpm_shader_to_string.h",
-    ]
-
-    deps = [
-      ":gl_lpm_fuzzer_proto",
-      "//base:base",
-    ]
-  }
-
-  test("gl_lpm_shader_to_string_unittest") {
-    sources = [
-      "command_buffer/tests/lpm/gl_lpm_shader_to_string_unittest.cc",
-    ]
-
-    deps = [
-      ":gl_lpm_shader_to_string",
-      "//base/test:run_all_unittests",
-      "//testing/gtest",
-      "//third_party/protobuf:protobuf_full",
-    ]
-  }
-
-  fuzzer_test("gl_lpm_fuzzer") {
-    sources = [
-      "command_buffer/tests/gl_manager.cc",
-      "command_buffer/tests/gl_manager.h",
-      "command_buffer/tests/gl_test_utils.cc",
-      "command_buffer/tests/gl_test_utils.h",
-      "command_buffer/tests/lpm/gl_lpm_fuzzer.cc",
-    ]
-
-    defines = [ "GL_GLEXT_PROTOTYPES" ]
-
-    deps = [
-      ":gl_lpm_fuzzer_proto",
-      ":gl_lpm_shader_to_string",
-      ":gles2",
-      ":test_support",
-      "//gpu/command_buffer/client:gles2_c_lib",
-      "//gpu/command_buffer/client:gles2_implementation",
-      "//gpu/command_buffer/common:gles2_utils",
-      "//gpu/ipc:gl_in_process_context",
-      "//gpu/ipc/service:service",
-      "//testing/gtest:gtest",
-      "//third_party/libprotobuf-mutator",
-      "//ui/gfx:gfx",
-      "//ui/gl:gl",
-      "//ui/gl/init:init",
-    ]
-  }
-}
-
 test("gl_tests") {
   sources = [
     "command_buffer/service/shared_image_backing_factory_gl_texture_unittest.cc",

gpu/DEPS

@@ -5,7 +5,7 @@ include_rules = [
   "+third_party/re2",
   "+third_party/smhasher",
   "+third_party/swiftshader",
-  "+third_party/protobuf",
+  "+third_party/protbuf",
   "+third_party/zlib",
   "+crypto",
   "+ui/gfx",

gpu/command_buffer/tests/gl_test_utils.cc

@@ -78,14 +78,14 @@ bool GLTestHelper::HasExtension(const char* extension) {
 }
 
 bool GLTestHelper::CheckGLError(const char* msg, int line) {
-  bool success = true;
-  GLenum error = GL_NO_ERROR;
-  while ((error = glGetError()) != GL_NO_ERROR) {
-    success = false;
-    EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), error)
-        << "GL ERROR in " << msg << " at line " << line << " : " << error;
-  }
-  return success;
+   bool success = true;
+   GLenum error = GL_NO_ERROR;
+   while ((error = glGetError()) != GL_NO_ERROR) {
+     success = false;
+     EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), error)
+         << "GL ERROR in " << msg << " at line " << line << " : " << error;
+   }
+   return success;
 }
 
 GLuint GLTestHelper::CompileShader(GLenum type, const char* shaderSrc) {
@@ -277,7 +277,7 @@ struct BitmapInfoHeader{
   uint8_t clr_important[4];
 };
 
-}  // namespace
+}
 
 bool GLTestHelper::SaveBackbufferAsBMP(
     const char* filename, int width, int height) {