Changed to apply UTF-8 to UCS2 conversion before assigning the string to nsString, bug 42873, r=cata.

docshell/base/nsWebShell.cpp

@@ -1203,7 +1203,7 @@ nsWebShell::OnEndDocumentLoad(nsIDocumentLoader* loader,
             {
             // only send non-qualified hosts to the keyword server
             nsAutoString keywordSpec; keywordSpec.AssignWithConversion("keyword:");
-            keywordSpec.AppendWithConversion(host);
+            keywordSpec.Append(NS_ConvertUTF8toUCS2(host));
             return LoadURI(keywordSpec.GetUnicode());
             } // end keywordsEnabled
          }

webshell/src/nsWebShell.cpp

@@ -1203,7 +1203,7 @@ nsWebShell::OnEndDocumentLoad(nsIDocumentLoader* loader,
             {
             // only send non-qualified hosts to the keyword server
             nsAutoString keywordSpec; keywordSpec.AssignWithConversion("keyword:");
-            keywordSpec.AppendWithConversion(host);
+            keywordSpec.Append(NS_ConvertUTF8toUCS2(host));
             return LoadURI(keywordSpec.GetUnicode());
             } // end keywordsEnabled
          }