Remove error-prone from our build.

Author: nedtwigg

build.gradle

@@ -12,7 +12,6 @@ repositories {
 apply from: rootProject.file('gradle/java-publish.gradle')
 apply from: rootProject.file('gradle/changelog.gradle')
 allprojects {
-	apply from: rootProject.file('gradle/error-prone.gradle')
 	apply from: rootProject.file('gradle/rewrite.gradle')
 	apply from: rootProject.file('gradle/spotless.gradle')
 }