[Extensions UI Mac] Update external install prompt strings to titlecase

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 9dcc81f0ef1436b3405ed5bf41b4383225e2b068..bd144c8d88269f869090ba36a37c70341e504628 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -3807,15 +3807,28 @@ From <ph name="DOWNLOAD_DOMAIN">$3<ex>example.com</ex></ph>
 
 <ph name="EXTENSION_NAME">$1<ex>Babylon Toolbar</ex></ph>
       </message>
-      <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_EXTENSION" desc="Button on the external install prompt to enable an extension installed by a third party.">
-        Enable extension
-      </message>
-      <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_APP" desc="Button on the external install prompt to enable an extension installed by a third party.">
-        Enable app
-      </message>
-      <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_THEME" desc="Button on the external install prompt to enable an extension installed by a third party.">
-        Enable theme
-      </message>
+      <if expr="use_titlecase">
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_EXTENSION" desc="Button on the external install prompt to enable an extension installed by a third party (title-case).">
+          Enable Extension
+        </message>
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_APP" desc="Button on the external install prompt to enable an extension installed by a third party (title-case).">
+          Enable App
+        </message>
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_THEME" desc="Button on the external install prompt to enable an extension installed by a third party (title-case).">
+          Enable Theme
+        </message>
+      </if>
+      <if expr="not use_titlecase">
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_EXTENSION" desc="Button on the external install prompt to enable an extension installed by a third party (sentence-case).">
+          Enable extension
+        </message>
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_APP" desc="Button on the external install prompt to enable an extension installed by a third party (sentence-case).">
+          Enable app
+        </message>
+        <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ACCEPT_BUTTON_THEME" desc="Button on the external install prompt to enable an extension installed by a third party (sentence-case).">
+          Enable theme
+        </message>
+      </if>
       <message name="IDS_EXTENSION_EXTERNAL_INSTALL_PROMPT_ABORT_BUTTON" desc="Button on the external install prompt to remove an extension installed by a third party.">
         Remove from Chrome
       </message>