261249 treat UTF-8 strings as UTF-8, not latin1. r=bzbarsky sr=darin

embedding/browser/activex/src/control/MozillaBrowser.cpp

@@ -441,7 +441,7 @@ LRESULT CMozillaBrowser::OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL&
                 ios->GetProtocolHandler(kDesignModeScheme, getter_AddRefs(ph));
                 if (ph &&
                     NS_SUCCEEDED(ph->GetScheme(phScheme)) &&
-                    phScheme.EqualsIgnoreCase(kDesignModeScheme))
+                    phScheme.LowerCaseEqualsASCII(kDesignModeScheme))
                 {
                     Navigate(const_cast<BSTR>(kDesignModeURL), NULL, NULL, NULL, NULL);
                 }

embedding/browser/activex/src/control/PropertyDlg.cpp

@@ -107,7 +107,8 @@ LRESULT CPPageDlg::OnInitDialog(UINT uMsg, WPARAM wParam,  LPARAM lParam, BOOL&
 
         nsCOMPtr<nsIMIMEInfo> mimeInfo;
         nsCAutoString contentType;
-        contentType.AssignWithConversion(mType);
+        // MIME Types are ASCII.
+        LossyCopyUTF16toASCII(mType, contentType);
         mimeService->GetFromTypeAndExtension(contentType, EmptyCString(), getter_AddRefs(mimeInfo));
         if (mimeInfo)
         {

embedding/browser/activex/src/plugin/XPConnect.cpp

@@ -329,7 +329,8 @@ nsScriptablePeer::ConvertVariants(nsIVariant *aIn, VARIANT *aOut)
         {
             nsCAutoString value;
             aIn->GetAsAUTF8String(value);
-            nsAutoString valueWide; valueWide.AssignWithConversion(value.get());
+            nsAutoString valueWide;
+            CopyUTF8toUTF16(value, valueWide);
             aOut->vt = VT_BSTR;
             aOut->bstrVal = SysAllocString(valueWide.get());
         }