Revert 155351 - Make DownloadManager::GetAllDownloads return all downloads regardless of state, per…

Revert 155351 - Make DownloadManager::GetAllDownloads return all downloads regardless of state, persistence, temporariness, or save page.

Also change some callers from SearchDownloads() over to GetAllDownloads().

This is an experiment in preparation for DownloadHistory-that-is-an-Observer, which removes the persisted concept from content. http://codereview.chromium.org/10665049/

I tried to inspect each caller in this CL to check that it would be ok with this change, but I might have missed something.


Reviewers breakdown:
Done:
rdsmith: *
jam: chrome/browser/automation
michaeln: chrome/browser/browsing_data
jcivelli: content/public/test

Review URL: https://chromiumcodereview.appspot.com/10913015

TBR=benjhayden@chromium.org
BUG=147359
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=155503