Make GetCommandExecuteImplClsid return the CLSID as a string directly.

win8/delegate_execute/delegate_execute.cc

Index: win8/delegate_execute/delegate_execute.cc
diff --git a/win8/delegate_execute/delegate_execute.cc b/win8/delegate_execute/delegate_execute.cc
index a41fb5bcc8ff8f886ceaa6847682cf671bae0315..01e1fd4366d01c21760669ee4ca0e6666f1a2aaf 100644
--- a/win8/delegate_execute/delegate_execute.cc
+++ b/win8/delegate_execute/delegate_execute.cc
@@ -46,10 +46,10 @@ class DelegateExecuteModule
 
   HRESULT PreMessageLoop(int nShowCmd) {
     HRESULT hr = S_OK;
-    base::string16 clsid_string;
     GUID clsid;
     BrowserDistribution* dist = BrowserDistribution::GetDistribution();
-    if (!dist->GetCommandExecuteImplClsid(&clsid_string))
+    const base::string16 clsid_string = dist->GetCommandExecuteImplClsid();
+    if (clsid_string.empty())
       return E_FAIL;
     hr = ::CLSIDFromString(clsid_string.c_str(), &clsid);
     if (FAILED(hr))