Move ExtensionWarningService and ExtensionsWarningSet to extensions.

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 a0c536827ca3fedfade410dcbc3d29051666b900..44ce2eb9ffd64bc5af5cec3a55c0c074e607279a 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5065,30 +5065,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_EXTENSION_WARNINGS_TITLE" desc="The title of a section in chrome://extensions which contains the warning(s) that relates to one particular extension">
         Warning:
       </message>
-      <message name="IDS_EXTENSION_WARNINGS_NETWORK_DELAY" desc="Warning message indicating that an extension caused excessive network delays for web requests">
-        This extension is slowing down <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>. You should disable it to restore <ph name="PRODUCT_NAME">$1<ex>Google Chrome</ex></ph>'s performance.
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_NETWORK_CONFLICT" desc="Warning message which indicates that two or more extensions tried to modify a network request in a conflicting way and the modification of this extension was ignored">
-        This extension failed to modify a network request because the modification conflicted with another extension.
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_REDIRECT_CONFLICT" desc="Warning message indicating that two extensions tried to redirect to different destinations">
-        This extension failed to redirect a network request to <ph name="ATTEMPTED_REDIRECT_DESTINATION">$1<ex>http://www.google.com</ex></ph> because another extension (<ph name="EXTENSION_NAME">$2<ex>My Cool Extension</ex></ph>) redirected it to <ph name="ACTUAL_REDIRECT_DESTINATION">$3<ex>https://www.google.com</ex></ph>.
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_REQUEST_HEADER_CONFLICT" desc="Warning message which indicates that two or more extensions tried to modify a network request in a conflicting way and the modification of this extension was ignored">
-        This extension failed to modify the request header "<ph name="HEADER_NAME">$1<ex>User-Agent</ex></ph>" of a network request because the modification conflicted with another extension (<ph name="EXTENSION_NAME">$2<ex>My Cool Extension</ex></ph>).
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_RESPONSE_HEADER_CONFLICT" desc="Warning message which indicates that two or more extensions tried to modify a network request in a conflicting way and the modification of this extension was ignored">
-        This extension failed to modify the response header "<ph name="HEADER_NAME">$1<ex>User-Agents</ex></ph>" of a network request because the modification conflicted with another extension (<ph name="EXTENSION_NAME">$2<ex>My Cool Extension</ex></ph>).
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_CREDENTIALS_CONFLICT" desc="Warning message which indicates that two or more extensions tried to modify a network request in a conflicting way and the modification of this extension was ignored">
-        This extension failed to provide credentials to a network request because another extension (<ph name="EXTENSION_NAME">$1<ex>My Cool Extension</ex></ph>) provided different credentials.
-      </message>
-      <message name="IDS_EXTENSION_WARNINGS_DOWNLOAD_FILENAME_CONFLICT" desc="Warning message which indicates that two or more extensions tried to determine the filename of a downloaded file in a conflicting way and the modification of this extension was ignored">
-        This extension failed to name the download "<ph name="ATTEMPTED_FILENAME">$1<ex>apple.png</ex></ph>" because another extension (<ph name="EXTENSION_NAME">$2<ex>My Cool Extension</ex></ph>) determined a different filename "<ph name="ACTUAL_FILENAME">$3<ex>banana.png</ex></ph>".
-      </message>
-      <message name="IDS_EXTENSION_WARNING_RELOAD_TOO_FREQUENT" desc="Warning message which indates that an extension got stuck in a reload loop.">
-        This extension reloaded itself too frequently.
-      </message>
 
       <!-- External extension install alerts -->
       <!-- TODO(mpcomplete): We may need to change Chrome to