Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm

Index: chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm
diff --git a/chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm b/chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm
index e5779eeaeca90638f6902b2afa4156fd301dff49..2e8c9d2661572bc2b5ae5c03a9fc04571b6bb420 100644
--- a/chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm
+++ b/chrome/browser/ui/cocoa/history_menu_bridge_unittest.mm
@@ -175,8 +175,9 @@ TEST_F(HistoryMenuBridgeTest, ClearHistoryMenuEmpty) {
 TEST_F(HistoryMenuBridgeTest, AddItemToMenu) {
   NSMenu* menu = [[[NSMenu alloc] initWithTitle:@"history foo"] autorelease];
 
-  const base::string16 short_url = ASCIIToUTF16("http://foo/");
-  const base::string16 long_url = ASCIIToUTF16("http://super-duper-long-url--."
+  const base::string16 short_url = base::ASCIIToUTF16("http://foo/");
+  const base::string16 long_url = base::ASCIIToUTF16(
+      "http://super-duper-long-url--."
       "that.cannot.possibly.fit.even-in-80-columns"
       "or.be.reasonably-displayed-in-a-menu"
       "without.looking-ridiculous.com/"); // 140 chars total
@@ -329,7 +330,7 @@ TEST_F(HistoryMenuBridgeTest, RecentlyClosedTabsAndWindows) {
 TEST_F(HistoryMenuBridgeTest, GetFaviconForHistoryItem) {
   // Create a fake item.
   HistoryMenuBridge::HistoryItem item;
-  item.title = ASCIIToUTF16("Title");
+  item.title = base::ASCIIToUTF16("Title");
   item.url = GURL("http://google.com");
 
   // Request the icon.