Update extensions with Drag-and-Drop in extension settings page.

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 5bc4192382995775bfdedeab5ed77bf2f4443959..2cd13e12210b77271306d73af9026ed4e45c2451 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4930,6 +4930,9 @@ Public Exponent (<ph name="PUBLIC_EXPONENT_NUM_BITS">$3<ex>24</ex></ph> bits):
       <message name="IDS_EXTENSION_POST_INSTALL_PERMISSIONS_PROMPT_TITLE" desc="Titlebar of the extension or app permissions review window">
         Current Permissions
       </message>
+      <message name="IDS_EXTENSION_UPDATE_PROMPT_TITLE" desc="Titlebar of the extension or app update prompt window">
+        Confirm Update
+      </message>
       <message name="IDS_EXTENSION_INSTALL_PROMPT_HEADING" desc="First bold line in the content area of the extension or app installation prompt. Asks the user if they want to install a particular extension or app.">
         Add "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
       </message>
@@ -4954,6 +4957,9 @@ Public Exponent (<ph name="PUBLIC_EXPONENT_NUM_BITS">$3<ex>24</ex></ph> bits):
       <message name="IDS_EXTENSION_POST_INSTALL_PERMISSIONS_PROMPT_HEADING" desc="First bold line in the content area of the extension or app permissions prompt. Shows the user the permissions a particular extension or app has.">
         <ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>
       </message>
+      <message name="IDS_EXTENSION_UPDATE_PROMPT_HEADING" desc="First bold line in the content area of the extension or app update prompt. Asks the user if they want to update a particular extension or app.">
+        Update "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
+      </message>
 
       <!-- Extension alerts. -->
       <message name="IDS_EXTENSION_ALERT_TITLE" desc="Titlebar of the extension notification alert">
@@ -5016,6 +5022,9 @@ Public Exponent (<ph name="PUBLIC_EXPONENT_NUM_BITS">$3<ex>24</ex></ph> bits):
       <message name="IDS_EXTENSION_PROMPT_OAUTH_PERMISSIONS_HEADER" desc="A line of explanatory text that precedes all GAIA account permissions that an extension might request. This is shown when an app requests permissions which are optional.">
         On your <ph name="ACCOUNT_EMAIL">$1<ex>user@example.com</ex></ph> account, it could:
       </message>
+      <message name="IDS_EXTENSION_PROMPT_OAUTH_UPDATE_HEADER" desc="A line of explanatory text that precedes all GAIA account permissions that an extension requests.  This is shown during extension or app update.">
+        On your <ph name="ACCOUNT_EMAIL">$1<ex>user@example.com</ex></ph> account, it can now:
+      </message>
 
       <if expr="pp_ifdef('android')">
         <message name="IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS" desc="Mobile: Permission string for full access to the mobile device and all websites.">
@@ -5623,6 +5632,9 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_EXTENSION_PROMPT_PERMISSIONS_ABORT_BUTTON" desc="Text for the deny button on the extension permissions prompt">
         Deny
       </message>
+      <message name="IDS_EXTENSION_PROMPT_UPDATE_BUTTON" desc="Text for the update button on the extension update prompt">
+        Update
+      </message>
       <message name="IDS_EXTENSION_WEB_STORE_TITLE" desc="Text for the Chrome Web Store">
         Chrome Web Store
       </message>