Update CBD dialog and Site Settings secondary strings in MD settings

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 2da9672f18eaa75dd008fbe7f7f98ac366dcce0f..759273e3975dee9465c81315f468e9f8bbec06dd 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -1613,13 +1613,13 @@
     Site Settings
   </message>
   <message name="IDS_SETTINGS_SITE_SETTINGS_DESCRIPTION" desc="Secondary, continued explanation of what content settings in Chrome do">
-    Control what content websites can show you and what information they can use as you browse
+    Control what information websites can use and what content they can show you

[srahim, 2017/03/17 23:26:08]

LGTM

   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA" desc="Text for clear browsing data button in Privacy options">
     Clear browsing data
   </message>
   <message name="IDS_SETTINGS_CLEAR_DATA_DESCRIPTION" desc="Description for clear browsing data button in Privacy options">

[srahim, 2017/03/17 23:26:08]

Add to message description: "History" refers to browsing history. "Cookies"
refers to the technical meaning of a cookie, i.e. data sent from a website and
stored on the user's computer, as in when a website saves your username or
password. 

-    Control your browsing data
+    Clear history, cookies, site data, cache…

[srahim, 2017/03/17 23:26:08]

Could we not use "cache" which isn't a very user-friendly word? Also I don't
think most users will know what "site data" is.

Some options:
A. If you want to list +2 things:
Clear history, cookies, images and files, and more

B. If you don't want to call out "images" for fear of users clearing images for
the wrong reasons:
Clear history, cookies, and more 

   </message>
   <message name="IDS_SETTINGS_TITLE_AND_COUNT" desc="The title of a section in the settings page with a count of the total number of items in the section">
     <ph name="TITLE">$1<ex>Block</ex></ph> - <ph name="COUNT">$2<ex>42</ex></ph>