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

chrome/browser/ui/app_list/search/mixer_unittest.cc

Index: chrome/browser/ui/app_list/search/mixer_unittest.cc
diff --git a/chrome/browser/ui/app_list/search/mixer_unittest.cc b/chrome/browser/ui/app_list/search/mixer_unittest.cc
index 98fa0496bfa74106ed8f85fd079d7752e4ef6fc9..036dcfa75cfd657cd560a0ae9e26d17e201cce64 100644
--- a/chrome/browser/ui/app_list/search/mixer_unittest.cc
+++ b/chrome/browser/ui/app_list/search/mixer_unittest.cc
@@ -22,7 +22,7 @@ class TestSearchResult : public ChromeSearchResult {
  public:
   TestSearchResult(const std::string& id, double relevance) {
     set_id(id);
-    set_title(UTF8ToUTF16(id));
+    set_title(base::UTF8ToUTF16(id));
     set_relevance(relevance);
   }
   virtual ~TestSearchResult() {}
@@ -111,7 +111,7 @@ class MixerTest : public testing::Test {
       if (!result.empty())
         result += ',';
 
-      result += UTF16ToUTF8(results_->GetItemAt(i)->title());
+      result += base::UTF16ToUTF8(results_->GetItemAt(i)->title());
     }
 
     return result;