Fix Java Checkstyle issues.

base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java

Index: base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java
diff --git a/base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java b/base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java
index df8b80f9103ff53347de39ef91d7fc881c60035b..c3a1df543b298ded1f576adc42cdbcf8983a2938 100644
--- a/base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java
+++ b/base/android/jni_generator/java/src/org/chromium/example/jni_generator/SampleForTests.java
@@ -162,13 +162,13 @@ class SampleForTests {
    */
 
   // String constants that look like comments don't confuse the generator:
-  private String arrgh = "*/*";
+  private String mArrgh = "*/*";
 
   //------------------------------------------------------------------------------------------------
   // Java fields which are accessed from C++ code only must be annotated with @AccessedByNative to
   // prevent them being eliminated when unreferenced code is stripped.
   @AccessedByNative
-  private int javaField;
+  private int mJavaField;
 
   //------------------------------------------------------------------------------------------------
   // The following methods demonstrate declaring methods to call into C++ from Java.