Convert implicit scoped_refptr constructor calls to explicit ones, part 1

chrome/common/webmessageportchannel_impl.cc

Index: chrome/common/webmessageportchannel_impl.cc
diff --git a/chrome/common/webmessageportchannel_impl.cc b/chrome/common/webmessageportchannel_impl.cc
index 888ab78f254503cdeebc6369687aed03df73d3e6..b7a938888214908f88ee781a44dbe178ed77233b 100644
--- a/chrome/common/webmessageportchannel_impl.cc
+++ b/chrome/common/webmessageportchannel_impl.cc
@@ -69,8 +69,8 @@ void WebMessagePortChannelImpl::entangle(WebMessagePortChannel* channel) {
   // The message port ids might not be set up yet, if this channel wasn't
   // created on the main thread.  So need to wait until we're on the main thread
   // before getting the other message port id.
-  scoped_refptr<WebMessagePortChannelImpl> webchannel =
-      static_cast<WebMessagePortChannelImpl*>(channel);
+  scoped_refptr<WebMessagePortChannelImpl> webchannel(
+      static_cast<WebMessagePortChannelImpl*>(channel));
   Entangle(webchannel);
 }