Revert "Add support for UTF-8 in application.properties"

This reverts commit d6a424f.

Closes gh-5361

# Conflicts:
#	spring-boot/src/test/resources/org/springframework/boot/env/test-encoded.properties

Author: snicoll

spring-boot/src/main/java/org/springframework/boot/env/PropertiesPropertySourceLoader.java

@@ -22,7 +22,6 @@
 import org.springframework.core.env.PropertiesPropertySource;
 import org.springframework.core.env.PropertySource;
 import org.springframework.core.io.Resource;
-import org.springframework.core.io.support.EncodedResource;
 import org.springframework.core.io.support.PropertiesLoaderUtils;
 
 /**
@@ -42,8 +41,7 @@ public String[] getFileExtensions() {
 	public PropertySource<?> load(String name, Resource resource, String profile)
 			throws IOException {
 		if (profile == null) {
-			Properties properties = PropertiesLoaderUtils
-					.loadProperties(new EncodedResource(resource, "UTF-8"));
+			Properties properties = PropertiesLoaderUtils.loadProperties(resource);
 			if (!properties.isEmpty()) {
 				return new PropertiesPropertySource(name, properties);
 			}

spring-boot/src/test/java/org/springframework/boot/env/PropertiesPropertySourceLoaderTests.java

@@ -46,13 +46,6 @@ public void loadProperties() throws Exception {
 		assertThat(source.getProperty("test"), equalTo((Object) "properties"));
 	}
 
-	@Test
-	public void loadPropertiesEncoded() throws Exception {
-		PropertySource<?> source = this.loader.load("encoded.properties",
-				new ClassPathResource("test-encoded.properties", getClass()), null);
-		assertThat(source.getProperty("test"), equalTo((Object) "prकperties"));
-	}
-
 	@Test
 	public void loadXml() throws Exception {
 		PropertySource<?> source = this.loader.load("test.xml",