Fix naming typo for Settings.TrackedSplitPreferenceChanged.

It was meant to be named Settings.TrackedSplitPreferenceChangedCount, but a typo was introduced in the code to Settings.TrackedSplitPreferenceChanged; it's now easier to keep the typo'ed name, making histograms.xml use it as well.

NOTRY=True

Review URL: https://codereview.chromium.org/169403007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251764 0039d316-1c4b-4281-b951-d872f2087c98
Removing unnecessary creation of RenderViewHostDestructionObserver for all WebContents

ProcessManager creates RenderViewHostDestructionObserver for all WebContents.
It's not necessary as ProcessManager keeps information about WebContents
only related to extensions (extension's background page, extension's popup).

BUG=344297

Review URL: https://codereview.chromium.org/169413002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251765 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251764
CrOs first-run UI polished.

* Added shadows for bubbles.
* Make app window to set its size automatically.
* Prevented buttons blinking on hover/click/focus.

BUG=342397
TEST=manually

Review URL: https://codereview.chromium.org/169173007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251767 0039d316-1c4b-4281-b951-d872f2087c98
Fixed typos in the policy documentation.

BUG= 343024

Review URL: https://codereview.chromium.org/169673003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251768 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251768