Remove third_party/webnn from build.

.gitignore

@@ -14,7 +14,6 @@
 /third_party/jsoncpp*
 /third_party/llvm-build
 /third_party/vulkan*
-/third_party/webnn_native
 /third_party/libFuzzer
 /third_party/*benchmark*
 /tools

build_overrides/gpgmm_features.gni

@@ -21,10 +21,6 @@ if (!defined(checkout_dawn)) {
   checkout_dawn = false
 }
 
-if (!defined(checkout_webnn)) {
-  checkout_webnn = false
-}
-
 declare_args() {
   # Enable GPGMM's ASSERTs even in release builds
   # Sets -dGPGMM_ENABLE_ASSERTS
@@ -41,9 +37,6 @@ declare_args() {
   # Enables compilation of Dawn's end2end tests.
   gpgmm_enable_dawn = checkout_dawn
 
-  # Enables compilation of WebNN's end2end tests.
-  gpgmm_enable_webnn = checkout_webnn
-
   # Build GPGMM as a shared library.
   # Sets -dGPGMM_SHARED_LIBRARY
   gpgmm_shared_library = false

scripts/regression_check.py

@@ -1,4 +1,3 @@
-# Copyright 2021 The WebNN Authors
 # Copyright 2022 The GPGMM Authors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");