Replace unused variable with simpler method calls

app-nia-catalog/build.gradle.kts

@@ -55,7 +55,7 @@ android {
     namespace = "com.google.samples.apps.niacatalog"
 
     buildTypes {
-        val release by getting {
+        release {
             // To publish on the Play store a private signing key is required, but to allow anyone
             // who clones the code to sign and run the release variant, use the debug signing key.
             // TODO: Abstract the signing configuration to a separate file to avoid hardcoding this.

app/build.gradle.kts

@@ -39,7 +39,7 @@ android {
     }
 
     buildTypes {
-        val debug by getting {
+        debug {
             applicationIdSuffix = NiaBuildType.DEBUG.applicationIdSuffix
         }
         val release by getting {
@@ -52,7 +52,7 @@ android {
             // TODO: Abstract the signing configuration to a separate file to avoid hardcoding this.
             signingConfig = signingConfigs.getByName("debug")
         }
-        val benchmark by creating {
+        create("benchmark") {
             // Enable all the optimizations from release build through initWith(release).
             initWith(release)
             matchingFallbacks.add("release")

benchmarks/build.gradle.kts

@@ -39,7 +39,7 @@ android {
         // This benchmark buildType is used for benchmarking, and should function like your
         // release build (for example, with minification on). It's signed with a debug key
         // for easy local/CI testing.
-        val benchmark by creating {
+        create("benchmark") {
             // Keep the build type debuggable so we can attach a debugger if needed.
             isDebuggable = true
             signingConfig = signingConfigs.getByName("debug")

core/datastore/build.gradle.kts

@@ -41,10 +41,10 @@ protobuf {
     generateProtoTasks {
         all().forEach { task ->
             task.builtins {
-                val java by registering {
+                register("java") {
                     option("lite")
                 }
-                val kotlin by registering {
+                register("kotlin") {
                     option("lite")
                 }
             }