Upgrade protobuf plugin to 0.10.0 (#896)

Author: jradcliff

google-ads/build.gradle

@@ -18,7 +18,6 @@
  */
 
 
-import com.google.common.collect.Sets
 import groovy.json.JsonSlurper
 
 import java.util.stream.Collectors
@@ -27,7 +26,7 @@ import static nl.javadude.gradle.plugins.license.DownloadLicensesExtension.licen
 
 plugins {
     id 'com.google.api-ads.java-conventions'
-    id 'com.google.protobuf' version '0.8.15'
+    id 'com.google.protobuf' version '0.10.0'
     id "com.github.hierynomus.license-report" version "0.16.1"
 }
 
@@ -155,7 +154,7 @@ task verifyLicenses() {
                 .map { it.licenseName }
                 .collect(Collectors.toSet())
         // Computes which licenses are in use but not permitted.
-        def notAllowed = Sets.difference(licenseNames, allowedLicenseNames)
+        def notAllowed = licenseNames - allowedLicenseNames
         if (!notAllowed.empty) {
             throw new GradleException(
                     """Licenses found which were not allowed: ${notAllowed}
@@ -345,7 +344,7 @@ sourceSets {
             // Adds the generated .java files from the protobuf plugin. This
             // isn't necessary strictly for Gradle, but IntelliJ doesn't
             // include the directory without this line.
-            srcDir new File(buildDir, 'generated/source/proto/test')
+            srcDir new File(buildDir, 'generated/sources/proto/test')
         }
         proto {
             srcDir 'src/test/resources/protos/'