Correct iOS build for latest Xcode beta.

ios/chrome/browser/updatable_config/updatable_config_base.mm

Index: ios/chrome/browser/updatable_config/updatable_config_base.mm
diff --git a/ios/chrome/browser/updatable_config/updatable_config_base.mm b/ios/chrome/browser/updatable_config/updatable_config_base.mm
index 80c3ddb83fb36b810043a6a200e63428e672769d..58d10581d9432307d594ce5ec543c0c64e9fbba5 100644
--- a/ios/chrome/browser/updatable_config/updatable_config_base.mm
+++ b/ios/chrome/browser/updatable_config/updatable_config_base.mm
@@ -113,11 +113,6 @@ class ConfigFetcher : public net::URLFetcherDelegate {
 }
 
 // Overrides default designated initializer.
-- (instancetype)init {
-  NOTREACHED();
-  return nil;
-}
-
 - (instancetype)initWithAppId:(NSString*)appId
                       version:(NSString*)appVersion
                         plist:(NSString*)plistName {
@@ -157,6 +152,11 @@ class ConfigFetcher : public net::URLFetcherDelegate {
   return self;
 }
 
+- (instancetype)init {
+  NOTREACHED();
+  return nil;
+}
+
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
 #if !defined(NDEBUG)