Convert string16 to base::string16 in content.

content/public/test/render_view_test.h

Index: content/public/test/render_view_test.h
diff --git a/content/public/test/render_view_test.h b/content/public/test/render_view_test.h
index 6a5c2a1815b98ce05946abf5311074bb3c6cc1ef..204d0231f9738b7951b6fcd07a1a386f79c5d06d 100644
--- a/content/public/test/render_view_test.h
+++ b/content/public/test/render_view_test.h
@@ -66,7 +66,8 @@ class RenderViewTest : public testing::Test {
   // |result|.
   // Returns true if the JavaScript was evaluated correctly to an int value,
   // false otherwise.
-  bool ExecuteJavaScriptAndReturnIntValue(const string16& script, int* result);
+  bool ExecuteJavaScriptAndReturnIntValue(const base::string16& script,
+                                          int* result);
 
   // Loads the given HTML into the main frame as a data: URL and blocks until
   // the navigation is committed.