Unrevert 228086 "rAc: improve loading screen sizing..."

This CL is not the tree-closer.

> Revert 228086 "rAc: improve loading screen sizing methodology"
> 
> Suspect for broken ash_unittests: http://build.chromium.org/p/chromium.win/builders/Win8%20Aura/builds/11043
> 
> > rAc: improve loading screen sizing methodology
> > 
> > Moves more logic into the controller and improves behavior when the Loading... screen is showing due to a user changing the active wallet account (which is only possible with multi login).
> > 
> > BUG=259543
> > 
> > Review URL: https://codereview.chromium.org/26341003
> 
> TBR=estade@chromium.org
> 
> Review URL: https://codereview.chromium.org/26491006

TBR=raymes@google.com

Review URL: https://codereview.chromium.org/26977002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228125 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228125
Add multi_profile_user_count field to system_profile proto.

BUG=297184

Review URL: https://codereview.chromium.org/25364002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228126 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228126
net: Manage all response writing related information with URLFetcherResponseWriter

Manage all response writing related information with response writers.
Reuse the same response writer for retry, instead of creating new ones.

Move data_ and response_destination_file_path_ from URLFetcherCore to response writer classes.
Remove response_destination_ and file_writer_ from URLFetcherCore, add AsStringWriter() and AsFileWriter() to URLFetcherResponseWriter instead.
Change URLFetcherResponseWriter::Initialize()'s behavior to allow reusing same instances on retry.
Clean up URLFetcherResponseWriter interface. (remove unnecessary methods, make some methods private)

BUG=126753
TEST=net_unittests

Review URL: https://codereview.chromium.org/25454006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228127 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228127
drive: Rewrite RemoveStaleCahceFilesTest to deal with local IDs properly

BUG=275270
TEST=unit_tests --gtest_filter="RemoveStaleCacheFilesTest.*"
R=kinaba@chromium.org

Review URL: https://codereview.chromium.org/26969002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228128 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228128