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

chrome/browser/ui/cocoa/website_settings_bubble_controller.mm

Index: chrome/browser/ui/cocoa/website_settings_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/website_settings_bubble_controller.mm b/chrome/browser/ui/cocoa/website_settings_bubble_controller.mm
index 82f0460816eaf38b12b309f86ce2254f369b5755..d09f4d32bedc8d341f8654713a672bf9de169f00 100644
--- a/chrome/browser/ui/cocoa/website_settings_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/website_settings_bubble_controller.mm
@@ -964,7 +964,7 @@ NSColor* IdentityVerifiedTextColor() {
 
   base::string16 labelText =
       WebsiteSettingsUI::PermissionTypeToUIString(permissionInfo.type) +
-      ASCIIToUTF16(":");
+      base::ASCIIToUTF16(":");
 
   NSTextField* label = [self addText:labelText
                             withSize:[NSFont smallSystemFontSize]
@@ -1029,7 +1029,7 @@ NSColor* IdentityVerifiedTextColor() {
 
   base::string16 labelText = l10n_util::GetStringFUTF16(
       IDS_WEBSITE_SETTINGS_SITE_DATA_STATS_LINE,
-      UTF8ToUTF16(cookieInfo.cookie_source),
+      base::UTF8ToUTF16(cookieInfo.cookie_source),
       base::IntToString16(cookieInfo.allowed),
       base::IntToString16(cookieInfo.blocked));