Changed the label for image screen according to mocks.

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 42cdff9fe19cc893e9c2d14af4fe0862285e6d38..ec5f284694d9daddca12e1070ec4f11233cfb334 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -3369,7 +3369,7 @@ each locale. -->
       </message>
       <!-- User Image Selection Dialog -->
       <message name="IDS_USER_IMAGE_SCREEN_TITLE" desc="String to be displayed in the title bar of the user image selection dialog">
-        Take a photo to identify your account at sign-in. You may change your photo later in Preferences.
+        Smile! Take a picture of yourself and set it as your account picture. You can change the picture later in Settings.

[altimofeev, 2010/11/17 13:52:45]

The mock says: "... the Options menu". So 'the Settings menu' instead of
'Settings' will be better.

[whywhat, 2010/11/17 13:56:25]

I took the exact wording from the mock. Guess Settings is percepted as
chrome://settings page now, so maybe "Settings page" is better?.
Ken, what do you think? :)

       </message>
       <message name="IDS_USER_IMAGE_NO_VIDEO" desc="Error text to be displayed on user image if camera fails to initialize">
         The camera failed to initialize. Please, try setting your photo later in Preferences.