Consistent formatting for Dawn/Tint.

This CL updates the clang format files to have a single shared format
between Dawn and Tint. The major changes are tabs are 4 spaces, lines
are 100 columns and namespaces are not indented.

Bug: dawn:1339
Change-Id: I4208742c95643998d9fd14e77a9cc558071ded39
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87603
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>

src/dawn/tests/DawnNativeTest.h

diff --git a/src/dawn/tests/DawnNativeTest.h b/src/dawn/tests/DawnNativeTest.h
index 53b6ab8..e92bf67 100644
--- a/src/dawn/tests/DawnNativeTest.h
+++ b/src/dawn/tests/DawnNativeTest.h
@@ -24,11 +24,11 @@
 
 namespace dawn::native {
 
-    // This is similar to DAWN_TRY_ASSIGN but produces a fatal GTest error if EXPR is an error.
+// This is similar to DAWN_TRY_ASSIGN but produces a fatal GTest error if EXPR is an error.
 #define DAWN_ASSERT_AND_ASSIGN(VAR, EXPR) \
     DAWN_TRY_ASSIGN_WITH_CLEANUP(VAR, EXPR, {}, AddFatalDawnFailure(#EXPR, error.get()))
 
-    void AddFatalDawnFailure(const char* expression, const ErrorData* error);
+void AddFatalDawnFailure(const char* expression, const ErrorData* error);
 
 }  // namespace dawn::native