Remove oak windows and its flags.

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 52d50247e85d8ba5ef78de47be4b8eef68554fb6..dbc6de577fff06d210c0097ef9e25c543ecfc53d 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -6414,12 +6414,6 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_NTP_OTHER_SESSIONS_MENU_DESCRIPTION" desc="Description for the flag to disable the 'Other devices' menu on the NTP.">
         Disable the new tab page menu for accessing tabs on other devices.
       </message>
-      <message name="IDS_FLAGS_ENABLE_ASH_OAK_NAME" desc="Name of the flag to enable the oak tree viewer in ash.">
-        Enable Oak.
-      </message>
-      <message name="IDS_FLAGS_ENABLE_ASH_OAK_DESCRIPTION" desc="Description of the flag to enable the oak tree viewer in ash.">
-        Enables the Oak tree viewer in ash. Allows inspection of window, layer and view hierarchies and their properties. Press Ctrl+Shift+F1 to access.
-      </message>
       <message name="IDS_FLAGS_ENABLE_DEVTOOLS_EXPERIMENTS_NAME" desc="Name for the flag to enable experiments in Developer Tools">
         Enable Developer Tools experiments.
       </message>