Enable noexcept on Windows, use for a few move constructors.

url/gurl.h

Index: url/gurl.h
diff --git a/url/gurl.h b/url/gurl.h
index 4cbd84656f989a63ff54ccf50fa3b3aa484c658c..74efbb5021e67515fa14738bd315a6338d344daf 100644
--- a/url/gurl.h
+++ b/url/gurl.h
@@ -54,7 +54,7 @@ class URL_EXPORT GURL {
   // Copy construction is relatively inexpensive, with most of the time going
   // to reallocating the string. It does not re-parse.
   GURL(const GURL& other);
-  GURL(GURL&& other);
+  GURL(GURL&& other) noexcept;
 
   // The strings to this contructor should be UTF-8 / UTF-16.
   explicit GURL(base::StringPiece url_string);