Remove dependency of NameResolverImpl on FqName

Remove AbstractJsProtoComparisonTest.getProtoData in favor of
(apparently copy-pasted) IncrementalJsCache.getProtoData

build-common/src/org/jetbrains/kotlin/incremental/IncrementalJsCache.kt

@@ -182,10 +182,11 @@ fun getProtoData(sourceFile: File, metadata: ByteArray): Map<ClassId, ProtoData>
     }
 
     proto.`package`.apply {
-        val packageFqName = getExtensionOrNull(JsProtoBuf.packageFqName)?.let(nameResolver::getPackageFqName) ?: FqName.ROOT
+        val packageFqName = getExtensionOrNull(JsProtoBuf.packageFqName)?.let(nameResolver::getPackageFqName)?.let(::FqName) ?: FqName.ROOT
         val packagePartClassId = ClassId(packageFqName, Name.identifier(sourceFile.nameWithoutExtension.capitalize() + "Kt"))
         classes[packagePartClassId] = PackagePartProtoData(this, nameResolver, packageFqName)
     }
+
     return classes
 }