Fixup lint errors.

This CL fixes up the various lint errors.

Change-Id: If4d3077b55aadec33980452c43917194d803fac6
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/31680
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>

src/diagnostic/formatter_test.cc

@@ -13,9 +13,9 @@
 // limitations under the License.
 
 #include "src/diagnostic/formatter.h"
-#include "src/diagnostic/diagnostic.h"
 
 #include "gtest/gtest.h"
+#include "src/diagnostic/diagnostic.h"
 
 namespace tint {
 namespace diag {

src/diagnostic/printer_linux.cc

@@ -12,12 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/diagnostic/printer.h"
-
 #include <unistd.h>
 
 #include <cstring>
 
+#include "src/diagnostic/printer.h"
+
 namespace tint {
 namespace diag {
 namespace {

src/diagnostic/printer_other.cc

@@ -12,10 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/diagnostic/printer.h"
-
 #include <cstring>
 
+#include "src/diagnostic/printer.h"
+
 namespace tint {
 namespace diag {
 namespace {

src/diagnostic/printer_windows.cc

@@ -12,10 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "src/diagnostic/printer.h"
-
 #include <cstring>
 
+#include "src/diagnostic/printer.h"
+
 #define WIN32_LEAN_AND_MEAN 1
 #include <Windows.h>