Replace string::find(prefix) == 0 pattern with base::StartsWith().

chrome/browser/extensions/api/cookies/cookies_helpers.cc

 // 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.
 
 // Implements common functionality for the Chrome Extensions Cookies API.
 
 #include "chrome/browser/extensions/api/cookies/cookies_helpers.h"
 
 #include <stddef.h>
 
@@ skipping 116 matching lines @@
   } else {
     cookie_store->GetAllCookiesAsync(callback);
   }
 }
 
 GURL GetURLFromCanonicalCookie(const net::CanonicalCookie& cookie) {
   const std::string& domain_key = cookie.Domain();
   const std::string scheme =
       cookie.IsSecure() ? url::kHttpsScheme : url::kHttpScheme;
   const std::string host =
-      domain_key.find('.') != 0 ? domain_key : domain_key.substr(1);
+      base::StartsWith(domain_key, ".", base::CompareCase::SENSITIVE)
+          ? domain_key.substr(1)
+          : domain_key;
   return GURL(scheme + url::kStandardSchemeSeparator + host + "/");
 }
 
 void AppendMatchingCookiesToVector(const net::CookieList& all_cookies,
                                    const GURL& url,
                                    const GetAll::Params::Details* details,
                                    const Extension* extension,
                                    std::vector<Cookie>* match_vector) {
   for (const net::CanonicalCookie& cookie : all_cookies) {
     // Ignore any cookie whose domain doesn't match the extension's
@@ skipping 62 matching lines @@
     if (sub_domain == *details_->domain)
       return true;
     const size_t next_dot = sub_domain.find('.', 1);  // Skip over leading dot.
     sub_domain.erase(0, next_dot);
   }
   return false;
 }
 
 }  // namespace cookies_helpers
 }  // namespace extensions