Remove unused field trial from ssl_client_socket_impl.cc

These two field trials are not actively being worked on. It's unclear whether
tuning the buffer size is still relevant given the other changes (with respect
to socket buffers) that landed since. This CL removes the field trials from the
code.

Bug: 631140
Change-Id: If4fc665551f76d35f36b702055fef64499e4e582
Reviewed-on: https://chromium-review.googlesource.com/1070650Reviewed-by: David Benjamin <davidben@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561323}

net/socket/ssl_client_socket_impl.cc

@@ -137,22 +137,6 @@ std::unique_ptr<base::Value> NetLogSSLInfoCallback(
   return std::move(dict);
 }
 
-int GetBufferSize(const char* field_trial) {
-  // Get buffer sizes from field trials, if possible. If values not present,
-  // use default.  Also make sure values are in reasonable range.
-  int buffer_size = kDefaultOpenSSLBufferSize;
-#if !defined(OS_NACL)
-  int override_buffer_size;
-  if (base::StringToInt(base::FieldTrialList::FindFullName(field_trial),
-                        &override_buffer_size)) {
-    buffer_size = override_buffer_size;
-    buffer_size = std::max(buffer_size, 1000);
-    buffer_size = std::min(buffer_size, 2 * kDefaultOpenSSLBufferSize);
-  }
-#endif  // !defined(OS_NACL)
-  return buffer_size;
-}
-
 std::unique_ptr<base::Value> NetLogSSLAlertCallback(
     const void* bytes,
     size_t len,
@@ -845,9 +829,9 @@ int SSLClientSocketImpl::Init() {
       SSL_set_session(ssl_.get(), session.get());
   }
 
-  transport_adapter_.reset(new SocketBIOAdapter(
-      transport_->socket(), GetBufferSize("SSLBufferSizeRecv"),
-      GetBufferSize("SSLBufferSizeSend"), this));
+  transport_adapter_.reset(
+      new SocketBIOAdapter(transport_->socket(), kDefaultOpenSSLBufferSize,
+                           kDefaultOpenSSLBufferSize, this));
   BIO* transport_bio = transport_adapter_->bio();
 
   BIO_up_ref(transport_bio);  // SSL_set0_rbio takes ownership.