Clean up type usage and fix MSVC "truncated value" warnings in net/quic/.

net/quic/quic_session.cc

Index: net/quic/quic_session.cc
diff --git a/net/quic/quic_session.cc b/net/quic/quic_session.cc
index d6af16e78964569b0f6f9e1a44814889aac010c8..f05395e77f56bf3c617e4ed8604de6bb3fbe3722 100644
--- a/net/quic/quic_session.cc
+++ b/net/quic/quic_session.cc
@@ -437,7 +437,7 @@ void QuicSession::UpdateFlowControlOnFinalReceivedByteOffset(
 
   DVLOG(1) << ENDPOINT << "Received final byte offset " << final_byte_offset
            << " for stream " << stream_id;
-  uint64 offset_diff = final_byte_offset - it->second;
+  QuicByteCount offset_diff = final_byte_offset - it->second;
   if (flow_controller_->UpdateHighestReceivedOffset(
       flow_controller_->highest_received_byte_offset() + offset_diff)) {
     // If the final offset violates flow control, close the connection now.
@@ -483,7 +483,8 @@ void QuicSession::OnConfigNegotiated() {
     if (config_.HasReceivedInitialFlowControlWindowBytes()) {
       // Streams which were created before the SHLO was received (0-RTT
       // requests) are now informed of the peer's initial flow control window.
-      uint32 new_window = config_.ReceivedInitialFlowControlWindowBytes();
+      QuicStreamOffset new_window =
+          config_.ReceivedInitialFlowControlWindowBytes();
       OnNewStreamFlowControlWindow(new_window);
       OnNewSessionFlowControlWindow(new_window);
     }
@@ -505,7 +506,7 @@ void QuicSession::OnConfigNegotiated() {
   }
 }
 
-void QuicSession::OnNewStreamFlowControlWindow(uint32 new_window) {
+void QuicSession::OnNewStreamFlowControlWindow(QuicStreamOffset new_window) {
   if (new_window < kDefaultFlowControlSendWindow) {
     LOG(ERROR)
         << "Peer sent us an invalid stream flow control send window: "
@@ -527,7 +528,7 @@ void QuicSession::OnNewStreamFlowControlWindow(uint32 new_window) {
   }
 }
 
-void QuicSession::OnNewSessionFlowControlWindow(uint32 new_window) {
+void QuicSession::OnNewSessionFlowControlWindow(QuicStreamOffset new_window) {
   if (new_window < kDefaultFlowControlSendWindow) {
     LOG(ERROR)
         << "Peer sent us an invalid session flow control send window: "