Reland "Reland "[webgpu-headers] Removes define for signalValue.""

This is a reland of commit ff76ecc5af96e5d307e4fcd3642401376423806a

Original change's description:
> Reland "[webgpu-headers] Removes define for signalValue."
>
> This is a reland of commit 79cd63939a7cb9d56cd5ebfc2af6d7e225cd102d
>
> Original change's description:
> > [webgpu-headers] Removes define for signalValue.
> >
> > See issue: github.com/webgpu-native/webgpu-headers/issues/130
> >
> > Change-Id: I8e37e489f864fe72a822d9ad0c3d42c780023997
> > Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/155980
> > Kokoro: Kokoro <noreply+kokoro@google.com>
> > Commit-Queue: Loko Kung <lokokung@google.com>
> > Reviewed-by: Austin Eng <enga@chromium.org>
>
> Change-Id: I8e70d9d04079f60aeec72d4a62d08b34a8d6e2df
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/155991
> Kokoro: Kokoro <noreply+kokoro@google.com>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Loko Kung <lokokung@google.com>
> Reviewed-by: Austin Eng <enga@chromium.org>

Change-Id: I0eabbfaa20e0d23a2dbc0258b34e01099e7ce3be
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/157061
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Loko Kung <lokokung@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
diff --git a/generator/templates/api.h b/generator/templates/api.h
index 7580287..37282dd 100644
--- a/generator/templates/api.h
+++ b/generator/templates/api.h
@@ -70,8 +70,6 @@
 #define {{API}}_NULLABLE
 #endif
 
-#define WGPU_BREAKING_WORK_DONE_SIGNAL_VALUE_CHANGE
-
 #include <stdint.h>
 #include <stddef.h>