redesign and reimplement proxy config service and tracker, revise proxy ui on cros

* original plan was to revise proxy ui on cros for all proxy sources and
  network types, refer to bug rpt 21219 for ui details
* redesign and reimplement PrefProxyConfigTracker and PrefProxyConfigService
  by switching the inter-dependencies between the two and renaming the latter
  - PrefProxyConfigService used to observe PrefProxyConfigTracker and retrieve
    new prefs proxy from the latter whenever the former gets notification of
    proxy change from prefs or delegate service to determine effective proxy
    config. Now, PrefProxyConfigTracker pushes new prefs proxy to the renamed
    ChromeProxyConfigService on the IO thread; the latter then uses it and proxy
    from delegate service to determine effective proxy config.
  - remove all thread-switching in PrefProxyConfigTracker which now lives and
    runs on UI thread, except for when it pushes proxy config to
    ChromeProxyConfigService on IO thread
  - enhances and moves ConfigState definition to namespace ProxyPrefs to
    indicate source of proxy config (policy, extension, other-precede, system,
    fallback) so that PrefProxyConfigTracker, ChromeProxyConfigService and
    chromeos::ProxyConfigServiceImpl can acccess it
  - extract code for deciding effective proxy config from PrefProxyConfigService
    into static PrefProxyConfigTracker method to be shared by all classes
* re-design and re-implement chromeos::ProxyConfigServiceImpl
  - this now extends PrefProxyConfigTracker to act as a special of "prefs",
    handles all proxy changes from network and prefs notifications and
    uses PrefProxyConfigTracker to push effective proxy to
    ChromeProxyConfigService and hence to network stack
  - remove wrapper chromeos::ProxyConfigService
  - this is the authority on cros, and ChromeProxyConfigService does not have
    a delegat service.
  - provide proxy config to ui for all proxy sources: policy, extension,
    network or recommended (in order of precedence), also indicates if proxy is
    user-modifiable
  - handle user profile changes to use correct PrefProxyConfigTracker
* modify CoreOptionsHandler and CoreChromeosOptionsHandler to implement dynamic
  monitoring of prefs::kProxy and on-the-fly ui changes of affected
  use-shared-proxies user pref
* modify ui native code, html, css and javascript for internet options and
  proxy pages to show yellow banner with different messages (same banner as
  options page when there's policy), en/dis-able ui fields, set current user
  profile in backend
* modify network dropdown menu to always show proxy settings menu item as long
  as there's a network
* modify automation tests, PrefProxyConfigTracker and ProxyConfigSerivceImpl
  unittests to handle redesign, fix unittests that fail due to redesign


BUG=chromium-os:20679,chromium-os:21219
TEST=verify per bugs rpts
Review URL: http://codereview.chromium.org/8102019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108616 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 2 deletions

diff --git a/chrome/browser/chromeos/preferences.h b/chrome/browser/chromeos/preferences.h
index 6c593e1..3566986 100644
--- a/chrome/browser/chromeos/preferences.h
+++ b/chrome/browser/chromeos/preferences.h
@@ -128,8 +128,6 @@ class Preferences : public content::NotificationObserver {
 
   BooleanPrefMember enable_screen_lock_;
 
-  BooleanPrefMember use_shared_proxies_;
-
   DISALLOW_COPY_AND_ASSIGN(Preferences);
 };