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

chrome/common/importer/ie_importer_test_registry_overrider_win.cc

Index: chrome/common/importer/ie_importer_test_registry_overrider_win.cc
diff --git a/chrome/common/importer/ie_importer_test_registry_overrider_win.cc b/chrome/common/importer/ie_importer_test_registry_overrider_win.cc
index 552a1d7ac8966a74512dd7a97030f4f791eef7c4..e84cb6502476d378a1824a52e4cf3222445b19bc 100644
--- a/chrome/common/importer/ie_importer_test_registry_overrider_win.cc
+++ b/chrome/common/importer/ie_importer_test_registry_overrider_win.cc
@@ -30,7 +30,7 @@ bool GetTestKeyFromEnvironment(base::string16* key) {
   std::string value;
   bool result = env->GetVar(kTestHKCUOverrideEnvironmentVariable, &value);
   if (result)
-    *key = UTF8ToUTF16(value);
+    *key = base::UTF8ToUTF16(value);
   return result;
 }
 
@@ -41,12 +41,12 @@ bool GetTestKeyFromEnvironment(base::string16* key) {
 
 IEImporterTestRegistryOverrider::IEImporterTestRegistryOverrider()
     : temporary_key_(kTestHKCUOverrideKeyPrefix +
-                     UTF8ToUTF16(base::GenerateGUID())) {
+                     base::UTF8ToUTF16(base::GenerateGUID())) {
   DCHECK(!GetTestKeyFromEnvironment(NULL));
 
   scoped_ptr<base::Environment> env(base::Environment::Create());
   bool success = env->SetVar(kTestHKCUOverrideEnvironmentVariable,
-                             UTF16ToUTF8(temporary_key_));
+                             base::UTF16ToUTF8(temporary_key_));
   DCHECK(success);
 }