Converts ios/web/net to ARC.

ios/web/net/clients/crw_js_injection_network_client.mm

Index: ios/web/net/clients/crw_js_injection_network_client.mm
diff --git a/ios/web/net/clients/crw_js_injection_network_client.mm b/ios/web/net/clients/crw_js_injection_network_client.mm
index 32c49abeb93aebfbe84e9a17a2ce861afe5bd14c..2ce43e6494f1314c8be727e8ea9807c5c56caa7a 100644
--- a/ios/web/net/clients/crw_js_injection_network_client.mm
+++ b/ios/web/net/clients/crw_js_injection_network_client.mm
@@ -8,12 +8,15 @@
 #include <stdint.h>
 
 #include "base/logging.h"
-#include "base/mac/objc_property_releaser.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/metrics/histogram.h"
 #import "ios/net/crn_http_url_response.h"
 #import "ios/third_party/blink/src/html_tokenizer.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)

[Eugene But (OOO till 7-30), 2016/08/19 16:34:50]

We don't need network clients code with WKWebView. We plan to remove request
tracker and all networks clients at some point. This is not dead code though and
these will be used during sign in and can leak. With that maybe we should not
convert network clients code at all?

+#error "This file requires ARC support."
+#endif
+
 // CRWJSInjectionNetworkClient injects an external script tag reference for
 // crweb.js into HTML and XHTML documents. To do this correctly, three data
 // points are needed: where to inject the script tag, what encoding the content
@@ -146,7 +149,7 @@ CRNHTTPURLResponse* ResponseWithUpdatedContentSize(
                                   HTTPVersion:[response cr_HTTPVersion]
                                  headerFields:all_headers_mutable];
 
-  return [update_response autorelease];
+  return update_response;
 }
 }  // namespace
 
@@ -298,7 +301,7 @@ CRNHTTPURLResponse* ResponseWithUpdatedContentSize(
     [super didReceiveResponse:response];
   } else {
   // Client calls [super didReceiveResponse:] in sendPendingResponse.
-    _pendingResponse.reset([static_cast<CRNHTTPURLResponse*>(response) retain]);
+  _pendingResponse.reset(static_cast<CRNHTTPURLResponse*>(response));
   }
 }
 
@@ -350,7 +353,7 @@ CRNHTTPURLResponse* ResponseWithUpdatedContentSize(
   NSString* jsContentString = [NSString
       stringWithFormat:kJSContentTemplate, [[NSUUID UUID] UUIDString]];
   _jsInjectionContent.reset(
-      [[jsContentString dataUsingEncoding:_contentEncoding] retain]);
+      [jsContentString dataUsingEncoding:_contentEncoding]);
 
   return _jsInjectionContent;
 }
@@ -393,7 +396,7 @@ CRNHTTPURLResponse* ResponseWithUpdatedContentSize(
     NSUInteger additionalLength = [[self jsInjectionContent] length];
     CRNHTTPURLResponse* responseToSend =
         ResponseWithUpdatedContentSize(_pendingResponse, additionalLength);
-    _pendingResponse.reset([responseToSend retain]);
+    _pendingResponse.reset(responseToSend);
   }
 
   [super didReceiveResponse:_pendingResponse];