Drops various GetDownloadProgress() APIs from the PDF viewer because:
1. We never call pp::URLRequestInfo::SetRecordDownloadProgress(), so
calls to pp::URLLoader::GetDownloadProgress() always return false.
2. We only use GetDownloadProgress() in DocumentLoaderImpl, to try to
get the total content length if we fail to get it from the
Content-Length header. But the total content length reported by
GetDownloadProgress() also comes from Content-Length, so this is not
useful.
3. GetDownloadProgress() won't be useful post-Pepper, as
blink::WebAssociatedURLLoader does not have a similar API. Instead,
the client is expected to track this internally.
Bug: 1099022
Change-Id: I6f2f183e84b2d9e4c0dee2c116ac08bce3dc4ed0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429545
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810442}
07cd7b0b98