Revert "Get rid of net::LOAD_ENABLE_UPLOAD_PROGRESS."

Revert "Get rid of net::LOAD_ENABLE_UPLOAD_PROGRESS."

> Get rid of net::LOAD_ENABLE_UPLOAD_PROGRESS.
> It's only used by Loader code.
> BUG=426442
>
> Review URL: https://codereview.chromium.org/669073003
>
> Cr-Commit-Position: refs/heads/master@{#301110}

TBR=ljagielski@opera.com
Reason for revert:
 This is causing use-of-unititialized-value on msan bots.
http://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20MSan%20Browser%20%281%29/builds/1746/steps/browser_tests/logs/stdio

==29276== WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x7fcb9a0f0d17 in content::ResourceLoader::ReportUploadProgress() content/browser/loader/resource_loader.cc:163:9
    #1 0x7fcb9a0f3241 in content::ResourceLoader::OnResponseStarted(net::URLRequest*) content/browser/loader/resource_loader.cc:341:3
    #2 0x7fcb980bb80f in net::URLRequestJob::NotifyHeadersComplete() net/url_request/url_request_job.cc:376:3
    #3 0x7fcb98304f13 in net::URLRequestHttpJob::NotifyHeadersComplete() net/url_request/url_request_http_job.cc:355:3
    #4 0x7fcb983080de in net::URLRequestHttpJob::SaveNextCookie() net/url_request/url_request_http_job.cc:692:5
    #5 0x7fcb98301b30 in net::URLRequestHttpJob::OnStartCompleted(int) net/url_request/url_request_http_job.cc:848:5
    #6 0x7fcb97f1f140 in Run base/callback.h:441:12
    #7 0x7fcb97f1f140 in net::HttpCache::Transaction::DoCallback(int) net/http/http_cache_transaction.cc:727:0
    #8 0x7fcb97f1ae2f in HandleResult net/http/http_cache_transaction.cc:733:5
    #9 0x7fcb97f1ae2f in net::HttpCache::Transaction::DoLoop(int) net/http/http_cache_transaction.cc:994:0
    #10 0x7fcb97f185f4 in net::HttpCache::Transaction::OnIOComplete(int) net/http/http_cache_transaction.cc:2955:3

Committed: https://chromium.googlesource.com/chromium/src/+/db286f1acb2466ee4af059c463a86bb66269d7e8

[oshima, 2014-10-24 17:45:06]

oshima@chromium.org changed reviewers:
+ ljagielski@opera.com

[commit-bot: I haz the power, 2014-10-24 17:46:49]

Patchset 1 (id:??) landed as
https://crrev.com/db286f1acb2466ee4af059c463a86bb66269d7e8
Cr-Commit-Position: refs/heads/master@{#301139}

[oshima, 2014-10-24 17:46:52]

Committed patchset #1 (id:1) manually as
db286f1acb2466ee4af059c463a86bb66269d7e8 (presubmit successful).