Remove deprecated URLRequest::Read

The last caller, URLLoader, can be changed simply to the new API.

Bug: 423484
Change-Id: Idd0233b098aeb78bc246580fca542e5f542b12a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893431
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711327}

net/url_request/url_request.cc

@@ -764,23 +764,6 @@ int URLRequest::Read(IOBuffer* dest, int dest_size) {
   return rv;
 }
 
-// Deprecated.
-bool URLRequest::Read(IOBuffer* dest, int dest_size, int* bytes_read) {
-  int result = Read(dest, dest_size);
-  if (result >= 0) {
-    *bytes_read = result;
-    return true;
-  }
-
-  if (result == ERR_IO_PENDING) {
-    *bytes_read = 0;
-  } else {
-    *bytes_read = -1;
-  }
-
-  return false;
-}
-
 void URLRequest::NotifyReceivedRedirect(const RedirectInfo& redirect_info,
                                         bool* defer_redirect) {
   is_redirecting_ = true;

net/url_request/url_request.h

@@ -153,12 +153,9 @@ class NET_EXPORT URLRequest : public base::SupportsUserData {
   //   Read() initiated by delegate
   //    - OnReadCompleted* (zero or more calls until all data is read)
   //
-  // Read() must be called at least once. Read() returns true when it completed
-  // immediately, and false if an IO is pending or if there is an error.  When
-  // Read() returns false, the caller can check the Request's status() to see
-  // if an error occurred, or if the IO is just pending.  When Read() returns
-  // true with zero bytes read, it indicates the end of the response.
-  //
+  // Read() must be called at least once. Read() returns bytes read when it
+  // completes immediately, and a negative error value if an IO is pending or if
+  // there is an error.
   class NET_EXPORT Delegate {
    public:
     // Called upon receiving a redirect.  The delegate may call the request's
@@ -617,9 +614,6 @@ class NET_EXPORT URLRequest : public base::SupportsUserData {
   //
   // The |max_bytes| parameter is the maximum number of bytes to read.
   int Read(IOBuffer* buf, int max_bytes);
-  // Deprecated.
-  // TODO(maksims): Remove this.
-  bool Read(IOBuffer* buf, int max_bytes, int* bytes_read);
 
   // This method may be called to follow a redirect that was deferred in
   // response to an OnReceivedRedirect call. If non-null,

services/network/url_loader.cc

@@ -1067,14 +1067,10 @@ void URLLoader::ReadMore() {
 
   auto buf = base::MakeRefCounted<NetToMojoIOBuffer>(
       pending_write_.get(), pending_write_buffer_offset_);
-  int bytes_read;
-  url_request_->Read(buf.get(),
-                     static_cast<int>(pending_write_buffer_size_ -
-                                      pending_write_buffer_offset_),
-                     &bytes_read);
-  if (url_request_->status().is_io_pending()) {
-    // Wait for OnReadCompleted.
-  } else {
+  int bytes_read = url_request_->Read(
+      buf.get(), static_cast<int>(pending_write_buffer_size_ -
+                                  pending_write_buffer_offset_));
+  if (bytes_read != net::ERR_IO_PENDING) {
     DidRead(bytes_read, true);
     // |this| may have been deleted.
   }