Standardize header guards for libdawn headers

generator/templates/api.h

diff --git a/generator/templates/api.h b/generator/templates/api.h
index 09890f7..5240d79 100644
--- a/generator/templates/api.h
+++ b/generator/templates/api.h
@@ -12,8 +12,8 @@
 //* See the License for the specific language governing permissions and
 //* limitations under the License.
 
-#ifndef DAWN_H
-#define DAWN_H
+#ifndef DAWN_DAWN_H_
+#define DAWN_DAWN_H_
 
 #include <stdint.h>
 #include <stddef.h>
@@ -100,4 +100,4 @@
 } // extern "C"
 #endif
 
-#endif // DAWN_H
+#endif // DAWN_DAWN_H_

generator/templates/apicpp.h

diff --git a/generator/templates/apicpp.h b/generator/templates/apicpp.h
index 8aa88ab..2813e01 100644
--- a/generator/templates/apicpp.h
+++ b/generator/templates/apicpp.h
@@ -12,8 +12,8 @@
 //* See the License for the specific language governing permissions and
 //* limitations under the License.
 
-#ifndef DAWNCPP_H
-#define DAWNCPP_H
+#ifndef DAWN_DAWNCPP_H_
+#define DAWN_DAWNCPP_H_
 
 #include "dawn.h"
 
@@ -160,4 +160,4 @@
 
 } // namespace dawn
 
-#endif // DAWNCPP_H
+#endif // DAWN_DAWNCPP_H_

generator/templates/apicpp_traits.h

diff --git a/generator/templates/apicpp_traits.h b/generator/templates/apicpp_traits.h
index 059f50f..4741ded 100644
--- a/generator/templates/apicpp_traits.h
+++ b/generator/templates/apicpp_traits.h
@@ -12,8 +12,8 @@
 //* See the License for the specific language governing permissions and
 //* limitations under the License.
 
-#ifndef DAWNCPP_TRAITS_H
-#define DAWNCPP_TRAITS_H
+#ifndef DAWN_DAWNCPP_TRAITS_H_
+#define DAWN_DAWNCPP_TRAITS_H_
 
 #include "dawncpp.h"
 
@@ -40,4 +40,4 @@
 
 }
 
-#endif // DAWNCPP_TRAITS_H
+#endif // DAWN_DAWNCPP_TRAITS_H_

src/include/dawn/dawn_wsi.h

diff --git a/src/include/dawn/dawn_wsi.h b/src/include/dawn/dawn_wsi.h
index 148de5b..8e42b21 100644
--- a/src/include/dawn/dawn_wsi.h
+++ b/src/include/dawn/dawn_wsi.h
@@ -1,19 +1,19 @@
-//* Copyright 2017 The Dawn Authors
-//*
-//* Licensed under the Apache License, Version 2.0 (the "License");
-//* you may not use this file except in compliance with the License.
-//* You may obtain a copy of the License at
-//*
-//*     http://www.apache.org/licenses/LICENSE-2.0
-//*
-//* Unless required by applicable law or agreed to in writing, software
-//* distributed under the License is distributed on an "AS IS" BASIS,
-//* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-//* See the License for the specific language governing permissions and
-//* limitations under the License.
+// Copyright 2017 The Dawn Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
-#ifndef DAWN_WSI_H
-#define DAWN_WSI_H
+#ifndef DAWN_DAWN_WSI_H_
+#define DAWN_DAWN_WSI_H_
 
 #include <dawn/dawn.h>
 
@@ -82,4 +82,4 @@
 } dawnWSIContextVulkan;
 #endif
 
-#endif  // DAWN_WSI_H
+#endif  // DAWN_DAWN_WSI_H