Adjust callers and networking delegates in ios/ to modified APIs

Use modified Read and delegate methods from the following CL-
https://codereview.chromium.org/2262653003/

BUG=423484

Committed: https://crrev.com/5af9098dfe78b06569f9007caa84349beca417df
Review-Url: https://codereview.chromium.org/2262063002
Cr-Original-Commit-Position: refs/heads/master@{#416528}
Cr-Commit-Position: refs/heads/master@{#416584}

ios/net/crn_http_protocol_handler.mm

@@ -540,7 +540,7 @@ void CompleteAuthentication(bool auth_ok,
     [data increaseLengthBy:bytes_read];
     memcpy(reinterpret_cast<char*>([data mutableBytes]) + data_length,
            buffer_->data(), bytes_read);
-    request->Read(buffer_.get(), kIOBufferSize, &bytes_read);
+    bytes_read = request->Read(buffer_.get(), kIOBufferSize);
   }
 
   if (tracker_)