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

chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm

Index: chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm
diff --git a/chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm b/chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm
index c3ae23d376e266e8bac4438073d64dca33f09c3d..3c379ee26a2ffe03e5370f29e0e82ba1a06fae61 100644
--- a/chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm
+++ b/chrome/browser/ui/cocoa/status_icons/status_icon_mac_unittest.mm
@@ -26,14 +26,14 @@ TEST_F(StatusIconMacTest, Create) {
   icon->SetImage(*image);
   gfx::ImageSkia* pressed = rb.GetImageSkiaNamed(IDR_STATUS_TRAY_ICON_PRESSED);
   icon->SetPressedImage(*pressed);
-  icon->SetToolTip(ASCIIToUTF16("tool tip"));
+  icon->SetToolTip(base::ASCIIToUTF16("tool tip"));
 }
 
 TEST_F(StatusIconMacTest, CreateMenu) {
   // Create a menu and verify by getting the title of the first menu item.
   const char* menu_title = "Menu Title";
   scoped_ptr<StatusIconMenuModel> model(new StatusIconMenuModel(NULL));
-  model->AddItem(0, ASCIIToUTF16(menu_title));
+  model->AddItem(0, base::ASCIIToUTF16(menu_title));
 
   scoped_ptr<StatusIconMac> icon(new StatusIconMac());
   icon->UpdatePlatformContextMenu(model.get());
@@ -49,11 +49,11 @@ TEST_F(StatusIconMacTest, MenuToolTip) {
   const char* menu_title = "Menu Title";
   const char* tool_tip = "Tool tip";
   scoped_ptr<StatusIconMenuModel> model(new StatusIconMenuModel(NULL));
-  model->AddItem(0, ASCIIToUTF16(menu_title));
+  model->AddItem(0, base::ASCIIToUTF16(menu_title));
 
   scoped_ptr<StatusIconMac> icon(new StatusIconMac());
   icon->UpdatePlatformContextMenu(model.get());
-  icon->SetToolTip(ASCIIToUTF16(tool_tip));
+  icon->SetToolTip(base::ASCIIToUTF16(tool_tip));
   EXPECT_EQ(2, [[icon->item() menu] numberOfItems]);
 
   NSMenuItem* toolTipItem = [[icon->item() menu] itemAtIndex:0];