Small improvements to JNI references.

base/android/scoped_java_ref_unittest.cc

Index: base/android/scoped_java_ref_unittest.cc
diff --git a/base/android/scoped_java_ref_unittest.cc b/base/android/scoped_java_ref_unittest.cc
index 3f4419af6d2b648174632dd9fa04ed24728ae1b4..99d035bb77defe2db4fa5253c820e2923f389a9f 100644
--- a/base/android/scoped_java_ref_unittest.cc
+++ b/base/android/scoped_java_ref_unittest.cc
@@ -106,6 +106,17 @@ TEST_F(ScopedJavaRefTest, RefCounts) {
       EXPECT_EQ(2, g_local_refs);
     }
     EXPECT_EQ(1, g_local_refs);
+    {
+      ScopedJavaLocalRef<jstring> str4((ScopedJavaLocalRef<jstring>(str2)));
+      EXPECT_EQ(2, g_local_refs);
+    }
+    EXPECT_EQ(1, g_local_refs);
+    {
+      ScopedJavaLocalRef<jstring> str5;
+      str5 = ScopedJavaLocalRef<jstring>(str2);
+      EXPECT_EQ(2, g_local_refs);
+    }
+    EXPECT_EQ(1, g_local_refs);
     str2.Reset();
     EXPECT_EQ(0, g_local_refs);
     global_str.Reset();