Use dinosaur icon on "you are offline" error page.

chrome/app/theme/theme_resources.grd

Index: chrome/app/theme/theme_resources.grd
diff --git a/chrome/app/theme/theme_resources.grd b/chrome/app/theme/theme_resources.grd
index c86a968658bf166049ccc81f254d851df7ddb865..8a9e420c58a1e10bfbba372286f374a2a1d387b7 100644
--- a/chrome/app/theme/theme_resources.grd
+++ b/chrome/app/theme/theme_resources.grd
@@ -248,6 +248,7 @@
         <structure type="chrome_scaled_image" name="IDR_ENROLL_SUCCESS" file="enroll_success.png" />
       </if>
       <structure type="chrome_scaled_image" name="IDR_ERROR_NETWORK_GENERIC" file="common/error_network_generic.png" />
+      <structure type="chrome_scaled_image" name="IDR_ERROR_NETWORK_OFFLINE" file="common/error_network_offline.png" />
       <structure type="chrome_scaled_image" name="IDR_EXTENSIONS_FAVICON" file="common/favicon_extensions.png" />
       <structure type="chrome_scaled_image" name="IDR_EXTENSIONS_SCRIPT_BUBBLE" file="common/script_bubble.png" />
       <structure type="chrome_scaled_image" name="IDR_EXTENSIONS_PUZZLE_PIECE" file="common/exstension-features_28.png" />
@@ -483,7 +484,6 @@
       </if>
       <if expr="pp_ifdef('chromeos')">
         <structure type="chrome_scaled_image" name="IDR_NETWORK_ADD_CONNECTION" file="cros/network_add_connection.png" />
-        <structure type="chrome_scaled_image" name="IDR_NETWORK_ERROR" file="cros/network_error.png" />
         <structure type="chrome_scaled_image" name="IDR_NETWORK_HIDE_PASSWORD" file="cros/network_hide_password.png" />
         <structure type="chrome_scaled_image" name="IDR_NETWORK_HIDE_PASSWORD_HOVER" file="cros/network_hide_password_hover.png" />
         <structure type="chrome_scaled_image" name="IDR_NETWORK_SHOW_PASSWORD" file="cros/network_show_password.png" />