Fix webgpu header file name in BUILD.gn (#2493)
A .h file was specified as .hpp file, causing `gn gen path/ --check` to
fail.
diff --git a/BUILD.gn b/BUILD.gn
index 96c5037..5aa1af8 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -515,7 +515,7 @@
"source/opt/function.cpp",
"source/opt/function.h",
"source/opt/generate_webgpu_initializers_pass.cpp",
- "source/opt/generate_webgpu_initializers_pass.hpp",
+ "source/opt/generate_webgpu_initializers_pass.h",
"source/opt/if_conversion.cpp",
"source/opt/if_conversion.h",
"source/opt/inline_exhaustive_pass.cpp",