Remove unused function declarations

Bug: dawn:1516
Change-Id: I7a62a80f3377c3b0675520d0eb71caa18c546bfa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110260
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
diff --git a/src/dawn/tests/DawnTest.h b/src/dawn/tests/DawnTest.h
index b81acc8..a7832d4 100644
--- a/src/dawn/tests/DawnTest.h
+++ b/src/dawn/tests/DawnTest.h
@@ -170,8 +170,6 @@
     bool HasBackendTypeFilter() const;
     wgpu::BackendType GetBackendTypeFilter() const;
     const char* GetWireTraceDir() const;
-    GLFWwindow* GetOpenGLWindow() const;
-    GLFWwindow* GetOpenGLESWindow() const;
 
     const std::vector<std::string>& GetEnabledToggles() const;
     const std::vector<std::string>& GetDisabledToggles() const;