Add base:: to string16 in Source/testing/runner/.

Source/testing/runner/SpellCheckClient.cpp

Index: Source/testing/runner/SpellCheckClient.cpp
diff --git a/Source/testing/runner/SpellCheckClient.cpp b/Source/testing/runner/SpellCheckClient.cpp
index 237e8f3e495a5e9ae1b1b081890676e76e0cb4eb..b8a3863da26e225d61f19465388be437637b697d 100644
--- a/Source/testing/runner/SpellCheckClient.cpp
+++ b/Source/testing/runner/SpellCheckClient.cpp
@@ -86,7 +86,7 @@ void SpellCheckClient::checkTextOfParagraph(const WebString& text, WebTextChecki
     vector<WebTextCheckingResult> results;
     if (mask & WebTextCheckingTypeSpelling) {
         size_t offset = 0;
-        string16 data = text;
+        base::string16 data = text;
         while (offset < data.length()) {
             int misspelledPosition = 0;
             int misspelledLength = 0;
@@ -135,7 +135,7 @@ void SpellCheckClient::finishLastTextCheck()
         return;
     vector<WebTextCheckingResult> results;
     int offset = 0;
-    string16 text = m_lastRequestedTextCheckString;
+    base::string16 text = m_lastRequestedTextCheckString;
     if (!m_spellcheck.isMultiWordMisspelling(WebString(text), &results)) {
         while (text.length()) {
             int misspelledPosition = 0;