Add extension permissions for Media Gallery API.

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 49b955342e554f0e4d289ec3aa4c9e6dd0d08be2..5a1914956c43d71272e715712a5249ace66c7c5d 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4408,6 +4408,9 @@ Update checks have repeatedly failed for the extension "<ph name="EXTENSION_NAME
       <message name="IDS_EXTENSION_PROMPT_WARNING_FILE_SYSTEM_WRITE" desc="Permission string for write access to the file system.">
         Write to files that you have opened in the application
       </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_MEDIA_GALLERIES_DEFAULT_ALL" desc="Permission string for access to all of the user's media galleries.">
+        Access all of your media files without further prompts

[Evan Stade, 2012/07/18 05:11:00]

I don't like the "without further prompts part", that's implicit in all
permissions. How about "Access all known media files on your device".

[vandebo (ex-Chrome), 2012/07/18 22:43:32]

Done.

+      </message>
 
       <!-- Extension/App error messages -->
       <message name="IDS_EXTENSION_CANT_GET_ABSOLUTE_PATH" desc="Warning displayed in pack dialog when the absolute path to the extension directory can not be found.">