Add base:: to string16s in chrome/.

chrome/installer/util/wmi.cc

Index: chrome/installer/util/wmi.cc
diff --git a/chrome/installer/util/wmi.cc b/chrome/installer/util/wmi.cc
index c625e6bc9c33e4ed620f9ff43de8bb400df91bf1..20c1050600f8c6c5f9f64ed862a755d89e47a06d 100644
--- a/chrome/installer/util/wmi.cc
+++ b/chrome/installer/util/wmi.cc
@@ -135,10 +135,10 @@ bool WMIProcess::Launch(const std::wstring& command_line, int* process_id) {
   return true;
 }
 
-string16 WMIComputerSystem::GetModel() {
+base::string16 WMIComputerSystem::GetModel() {
   base::win::ScopedComPtr<IWbemServices> services;
   if (!WMI::CreateLocalConnection(true, services.Receive()))
-    return string16();
+    return base::string16();
 
   base::win::ScopedBstr query_language(L"WQL");
   base::win::ScopedBstr query(L"SELECT * FROM Win32_ComputerSystem");
@@ -148,21 +148,21 @@ string16 WMIComputerSystem::GetModel() {
       WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL,
       enumerator.Receive());
   if (FAILED(hr) || !enumerator)
-    return string16();
+    return base::string16();
 
   base::win::ScopedComPtr<IWbemClassObject> class_object;
   ULONG items_returned = 0;
   hr = enumerator->Next(WBEM_INFINITE, 1,  class_object.Receive(),
                         &items_returned);
   if (!items_returned)
-    return string16();
+    return base::string16();
 
   base::win::ScopedVariant manufacturer;
   class_object->Get(L"Manufacturer", 0, manufacturer.Receive(), 0, 0);
   base::win::ScopedVariant model;
   class_object->Get(L"Model", 0, model.Receive(), 0, 0);
 
-  string16 model_string;
+  base::string16 model_string;
   if (manufacturer.type() == VT_BSTR) {
     model_string = V_BSTR(&manufacturer);
     if (model.type() == VT_BSTR)