Rename NOTIFICATION_RENDERER_PROCESS_HANG to NOTIFICATION_RENDER_WIDGET_HOST_HANG as it is being sent out by the RenderWidgetHost.

BUG=none
TEST=no change

Review URL: https://codereview.chromium.org/64683003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234063 0039d316-1c4b-4281-b951-d872f2087c98
Fixes notification center view if all are removed with settings open.

This causes the message center view to be completely swapped out
for the NoNotificationMessageView instead of adding the
NoNotificationMessageView as a child to the MessageListView.

BUG=312890

Review URL: https://codereview.chromium.org/64943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234064 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234064
Move chrome/common/extensions/background_info.h to src/extensions

This is part of a refactor to extract extensions code from Chrome.

To allow the move:
* Extract extensions::file_util from extension_file_util.h/cc
* Move switches::kAllowHTTPBackgroundPage to extensions/common/switches.h

BUG=316218
TEST=compiles, unit_tests
TBR=ben@chromium.org for mechanical header file renames across chrome/browser

Review URL: https://codereview.chromium.org/65123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234065 0039d316-1c4b-4281-b951-d872f2087c98
Only open new tabs (e.g. as a result of clicking "Manage my X...") to the
immediate right of the dialog's tab.

R=estade@chromium.org
BUG=315970
TEST=browser_tests, manual

Review URL: https://codereview.chromium.org/65303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234066 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234065
SVN changes up to revision 234066