Adds media license nodes to cookie tree model and cookies view.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 33b908ea0a55f4aed0a20b5b88c0495af7069b85..64b5526fbd1a2a564200e51f3b9b2268826aca45 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -10535,6 +10535,12 @@ I don't think this site should be blocked!
       <message name="IDS_COOKIES_INDEXED_DBS" desc="Label for Indexed Databases (name of an HTML standard)">
         Indexed databases
       </message>
+      <message name="IDS_COOKIES_MEDIA_LICENSE" desc="The text shown when there is an Media License in the Cookies table">

[msramek, 2016/09/26 18:28:05]

Is there a reason why it's "media licenses" here but "content licenses" in the
Clear Browsing Data dialog? Is it again because of Flash?

I have the following scenario in mind:

1. The user deletes "Cookies and site data" in
chrome://settings/clearBrowserData
2. The user inspects cookies and site data in chrome://settings/cookies
3. The user sees that not everything was deleted - media licenses are there.
4. The user remembers that there was a checkbox for media licenses in
chrome://settings/clearBrowserData and understands that if they wanted media
licenses to be cleared, they should have checked that checkbox as well.

The fact that they are named differently in the two decreases the likelihood of
#4.

[jrummell, 2016/09/27 18:21:15]

In M54 "Content licenses" was changed to "Media licenses" in the Clear Browsing
Data dialog (https://codereview.chromium.org/2075023002/).

[msramek, 2016/09/28 12:28:59]

Apologies! I am of course aware of the change, I just misremembered that it was
in the opposite direction.

+        Media license
+      </message>
+      <message name="IDS_COOKIES_MEDIA_LICENSES" desc="Label for Media Licenses">
+        Media licenses
+      </message>
       <message name="IDS_COOKIES_FILE_SYSTEM" desc="The text shown when there is a file system (name of an HTML standard) in the Cookies table">
         File system
       </message>