Standardize to more kt-compatible syntax

The groovy file syntax was very inconsistent, and as we are moving toward
being able to configure gradle with kotlin instead of groovy, the kt-compatible
syntax is preferred by the build team.

Change-Id: I8692107f9095a5725364318ff6628101686389f1
diff --git a/benchmark/common/build.gradle b/benchmark/common/build.gradle
index 686ab9a..ebeeee7 100644
--- a/benchmark/common/build.gradle
+++ b/benchmark/common/build.gradle
@@ -52,4 +52,4 @@
     kotlinOptions {
         freeCompilerArgs += ["-Xuse-experimental=kotlin.Experimental"]
     }
-}
\ No newline at end of file
+}