Replace base::NullableString16(bool) usage with default constructor.

webkit/browser/dom_storage/session_storage_database_unittest.cc

Index: webkit/browser/dom_storage/session_storage_database_unittest.cc
diff --git a/webkit/browser/dom_storage/session_storage_database_unittest.cc b/webkit/browser/dom_storage/session_storage_database_unittest.cc
index 4cbd947eee6a1c9b3c6f694fa71c82edce736c2b..d97ca0dfa9bbb1a333b2ae583bd30257cf424a47 100644
--- a/webkit/browser/dom_storage/session_storage_database_unittest.cc
+++ b/webkit/browser/dom_storage/session_storage_database_unittest.cc
@@ -89,11 +89,10 @@ SessionStorageDatabaseTest::SessionStorageDatabaseTest()
       kKey1(ASCIIToUTF16("key1")),
       kKey2(ASCIIToUTF16("key2")),
       kKey3(ASCIIToUTF16("key3")),
-      kValue1(base::NullableString16(ASCIIToUTF16("value1"), false)),
-      kValue2(base::NullableString16(ASCIIToUTF16("value2"), false)),
-      kValue3(base::NullableString16(ASCIIToUTF16("value3"), false)),
-      kValue4(base::NullableString16(ASCIIToUTF16("value4"), false)),
-      kValueNull(base::NullableString16(true)) { }
+      kValue1(ASCIIToUTF16("value1"), false),
+      kValue2(ASCIIToUTF16("value2"), false),
+      kValue3(ASCIIToUTF16("value3"), false),
+      kValue4(ASCIIToUTF16("value4"), false) { }
 
 SessionStorageDatabaseTest::~SessionStorageDatabaseTest() { }