Convert string16 to base::string16 in content.

content/browser/worker_host/test/worker_browsertest.cc

Index: content/browser/worker_host/test/worker_browsertest.cc
diff --git a/content/browser/worker_host/test/worker_browsertest.cc b/content/browser/worker_host/test/worker_browsertest.cc
index a71a28e1f99b49289234ed984c425b3e1518ae72..acd00fba10182ee6e1bc83bac2088b143b5d92ba 100644
--- a/content/browser/worker_host/test/worker_browsertest.cc
+++ b/content/browser/worker_host/test/worker_browsertest.cc
@@ -42,10 +42,10 @@ class WorkerTest : public ContentBrowserTest {
                const std::string& test_case,
                const std::string& query) {
     GURL url = GetTestURL(test_case, query);
-    const string16 expected_title = ASCIIToUTF16("OK");
+    const base::string16 expected_title = ASCIIToUTF16("OK");
     TitleWatcher title_watcher(window->web_contents(), expected_title);
     NavigateToURL(window, url);
-    string16 final_title = title_watcher.WaitAndGetTitle();
+    base::string16 final_title = title_watcher.WaitAndGetTitle();
     EXPECT_EQ(expected_title, final_title);
   }
 
@@ -275,10 +275,10 @@ IN_PROC_BROWSER_TEST_F(WorkerTest, WebSocketSharedWorker) {
 
   // Run test.
   Shell* window = shell();
-  const string16 expected_title = ASCIIToUTF16("OK");
+  const base::string16 expected_title = ASCIIToUTF16("OK");
   TitleWatcher title_watcher(window->web_contents(), expected_title);
   NavigateToURL(window, url);
-  string16 final_title = title_watcher.WaitAndGetTitle();
+  base::string16 final_title = title_watcher.WaitAndGetTitle();
   EXPECT_EQ(expected_title, final_title);
 }