Fix number parsing problems with HttpResponseHeaders::GetAgeValue() to not accept invalid numbers.

net/http/http_response_headers.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 #define NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 235 matching lines @@
   FreshnessLifetimes GetFreshnessLifetimes(
       const base::Time& response_time) const;
 
   // Returns the age of the response.  See section 13.2.3 of RFC 2616.
   // See RequiresValidation for a description of this method's parameters.
   base::TimeDelta GetCurrentAge(const base::Time& request_time,
                                 const base::Time& response_time,
                                 const base::Time& current_time) const;
 
   // The following methods extract values from the response headers.  If a
-  // value is not present, then false is returned.  Otherwise, true is returned
-  // and the out param is assigned to the corresponding value.
+  // value is not present, or is invalid, then false is returned.  Otherwise,
+  // true is returned and the out param is assigned to the corresponding value.
   bool GetMaxAgeValue(base::TimeDelta* value) const;
   bool GetAgeValue(base::TimeDelta* value) const;
   bool GetDateValue(base::Time* value) const;
   bool GetLastModifiedValue(base::Time* value) const;
   bool GetExpiresValue(base::Time* value) const;
   bool GetStaleWhileRevalidateValue(base::TimeDelta* value) const;
 
   // Extracts the time value of a particular header.  This method looks for the
   // first matching header value and parses its value as a HTTP-date.
   bool GetTimeValuedHeader(const std::string& name, base::Time* result) const;
@@ skipping 153 matching lines @@
 
   // The normalized http version (consistent with what GetStatusLine() returns).
   HttpVersion http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_