Add parens around url/origin argument to DEBUG_ALIAS macros.

This allows more complex expressions to be used without confusing the
compiler.

TBR=mkwst@chromium.org

Change-Id: I0b6d3a9526ac932bf1a8e3f7e9b3a76e3da34927
Reviewed-on: https://chromium-review.googlesource.com/1026805
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553378}

url/gurl.h

@@ -485,6 +485,6 @@ URL_EXPORT bool operator!=(const base::StringPiece& spec, const GURL& x);
 // variable named |<var_name>|.  This helps ensure that the value of |url| gets
 // preserved in crash dumps.
 #define DEBUG_ALIAS_FOR_GURL(var_name, url) \
-  DEBUG_ALIAS_FOR_CSTR(var_name, url.possibly_invalid_spec().c_str(), 128)
+  DEBUG_ALIAS_FOR_CSTR(var_name, (url).possibly_invalid_spec().c_str(), 128)
 
 #endif  // URL_GURL_H_

url/origin.h

@@ -172,7 +172,7 @@ URL_EXPORT bool IsSameOriginWith(const GURL& a, const GURL& b);
 // stack-allocated variable named |<var_name>|.  This helps ensure that the
 // value of |origin| gets preserved in crash dumps.
 #define DEBUG_ALIAS_FOR_ORIGIN(var_name, origin) \
-  DEBUG_ALIAS_FOR_CSTR(var_name, origin.Serialize().c_str(), 128)
+  DEBUG_ALIAS_FOR_CSTR(var_name, (origin).Serialize().c_str(), 128)
 
 }  // namespace url