Remove --host-resolver-retry-attempts.

This doesn't seem to have seen a whole lot of use.

BUG=727894

Review-Url: https://codereview.chromium.org/2912163002
Cr-Commit-Position: refs/heads/master@{#475704}

chrome/browser/io_thread.cc

@@ -222,20 +222,6 @@ std::unique_ptr<net::HostResolver> CreateGlobalHostResolver(
       *base::CommandLine::ForCurrentProcess();
 
   net::HostResolver::Options options;
-
-  // Use the retry attempts override from the command-line, if any.
-  if (command_line.HasSwitch(switches::kHostResolverRetryAttempts)) {
-    std::string s =
-        command_line.GetSwitchValueASCII(switches::kHostResolverRetryAttempts);
-    // Parse the switch (it should be a non-negative integer).
-    int n;
-    if (base::StringToInt(s, &n) && n >= 0) {
-      options.max_retry_attempts = static_cast<size_t>(n);
-    } else {
-      LOG(ERROR) << "Invalid switch for host resolver retry attempts: " << s;
-    }
-  }
-
   std::unique_ptr<net::HostResolver> global_host_resolver;
 #if defined OS_CHROMEOS
   global_host_resolver =

chrome/common/chrome_switches.cc

@@ -507,10 +507,6 @@ const char kForceVariationIds[]             = "force-variation-ids";
 // http://google.com.
 const char kHomePage[]                      = "homepage";
 
-// The maximum number of retry attempts to resolve the host. Set this to zero
-// to disable host resolver retry attempts.
-const char kHostResolverRetryAttempts[]     = "host-resolver-retry-attempts";
-
 // Comma-separated list of rules that control how hostnames are mapped.
 //
 // For example:

chrome/common/chrome_switches.h

@@ -156,7 +156,6 @@ extern const char kForceFirstRun[];
 extern const char kForceLocalNtp[];
 extern const char kForceVariationIds[];
 extern const char kHomePage[];
-extern const char kHostResolverRetryAttempts[];
 extern const char kHostRules[];
 extern const char kIgnoreCertificateErrorsSPKIList[];
 extern const char kIgnoreUrlFetcherCertRequests[];