Update description of fullscreen-within-tab experiment in about:flags.

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 88438479a409eb3b89c3d813a2c73b3b60c82ecd..847ef74c8ef64fe4e76c54103b04644f29ca0ec9 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -7001,11 +7001,11 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_ENABLE_PASSWORD_BUBBLE_DESCRIPTION" desc="Description for the flag to enable the Manage Passwords Bubble feature.">
         Enables the Passwords Bubble. The Passwords Bubble provides an easy way to store and manage passwords for a website. It replaced the infobad for saving passwords.
       </message>
-      <message name="IDS_FLAGS_EMBED_FLASH_FULLSCREEN_NAME" desc="Name of about:flags option to embed flash fullscreen within the browser tab.">
-        Embed Flash fullscreen within browser tab
+      <message name="IDS_FLAGS_FULLSCREEN_WITHIN_TAB_NAME" desc="Name of about:flags option to enable new fullscreen-within-tab behaviors.">
+        Fullscreen-within-tab UI
       </message>
-      <message name="IDS_FLAGS_EMBED_FLASH_FULLSCREEN_DESCRIPTION" desc="Description for the about:flags option to embed flash fullscreen within the browser tab.">
-        Embeds Flash fullscreen windows within the tab contents area and fullscreens the browser window.  This makes the Flash fullscreen user experience consistent with all other browser fullscreen modes.  When disabled, Flash fullscreen will open in a separate fullscreened window.
+      <message name="IDS_FLAGS_FULLSCREEN_WITHIN_TAB_DESCRIPTION" desc="Description for the about:flags option to enable new fullscreen-within-tab behaviors.">
+        When enabled, Pepper/Flash fullscreen widgets are embedded within the browser window to make the fullscreen user experience consistent with all other browser fullscreen modes. In addition, while screen-capturing a tab, the browser window will not fullscreen. This allows the user to retain control of their desktop to work in other browser tabs or applications.
       </message>
       <message name="IDS_FLAGS_ENABLE_PERMISSIONS_BUBBLES_NAME" desc="Title for the flag to enable showing permissions requests in bubbles.">
         Use Bubbles for Permission Requests