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

chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc

Index: chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc
diff --git a/chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc b/chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc
index 7cdfd61a70e34bfef294b1df2f0cc5987f5cbbff..c665fc3aa260dffda55e343082b568e4fae1be44 100644
--- a/chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc
+++ b/chrome/browser/ui/fullscreen/fullscreen_exit_bubble_type.cc
@@ -18,7 +18,7 @@ namespace fullscreen_bubble {
 base::string16 GetLabelTextForType(FullscreenExitBubbleType type,
                                    const GURL& url,
                                    ExtensionService* extension_service) {
-  base::string16 host(UTF8ToUTF16(url.host()));
+  base::string16 host(base::UTF8ToUTF16(url.host()));
   if (extension_service) {
     const extensions::ExtensionSet* extensions =
         extension_service->extensions();
@@ -26,7 +26,7 @@ base::string16 GetLabelTextForType(FullscreenExitBubbleType type,
     const extensions::Extension* extension =
         extensions->GetExtensionOrAppByURL(url);
     if (extension) {
-      host = UTF8ToUTF16(extension->name());
+      host = base::UTF8ToUTF16(extension->name());
     } else if (url.SchemeIs(extensions::kExtensionScheme)) {
       // In this case, |host| is set to an extension ID.
       // We are not going to show it because it's human-unreadable.