Remove redundant assignment for SPIRV_SKIP_TESTS

- already done above

Change-Id: I4cfd71cb23b8ff23bdf01ecbb7b0346b90cf05dc
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/194903
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Jaswant Panchumarti <jaswant.panchumarti@kitware.com>
Auto-Submit: Jaswant Panchumarti <jaswant.panchumarti@kitware.com>
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index 9d433b4..98e2898 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -61,14 +61,10 @@
         OR TINT_BUILD_SPV_READER
         OR TINT_BUILD_SPV_WRITER
         OR DAWN_USE_BUILT_DXC))
-    set(SPIRV_SKIP_TESTS ON CACHE BOOL "" FORCE)
+    set(SPIRV_SKIP_TESTS ON CACHE BOOL "Controls whether SPIR-V tests are run" FORCE)
     set(SPIRV_SKIP_EXECUTABLES ON CACHE BOOL "" FORCE)
     set(SKIP_SPIRV_TOOLS_INSTALL ON CACHE BOOL "" FORCE)
-
-    if(TINT_BUILD_SPV_READER OR TINT_BUILD_SPV_WRITER)
-        set(SPIRV_SKIP_TESTS ON CACHE BOOL "Controls whether SPIR-V tests are run" FORCE)
-        set(SPIRV_WERROR OFF CACHE BOOL OFF FORCE)
-    endif()
+    set(SPIRV_WERROR OFF CACHE BOOL OFF FORCE)
 
     message(STATUS "Dawn: using SPIRV-Tools at ${DAWN_SPIRV_TOOLS_DIR}")
     add_subdirectory(${DAWN_SPIRV_TOOLS_DIR} "${CMAKE_CURRENT_BINARY_DIR}/spirv-tools" EXCLUDE_FROM_ALL)