Change Page Info string for local files

This cl changes the button text displayed in the omnibox
for local files. "File" text is added to the chip and
clicking on the button will display the text "You're
viewing a file".

A follow-up cl will elide file:// from the omnibox display.

Screenshot:
https://drive.google.com/file/d/1eiFK6FfonGqihqYCheFZmDtI-Qv8UPPZ/view?usp=sharing

Bug: 818528
Change-Id: Ideb4c8aaefbe50afd2cdfd3236d1c72809d04fe3
Reviewed-on: https://chromium-review.googlesource.com/1187132
Commit-Queue: Livvie Lin <[email protected]>
Reviewed-by: Peter Kasting <[email protected]>
Reviewed-by: Mustafa Emre Acer <[email protected]>
Cr-Commit-Position: refs/heads/master@{#587277}
diff --git a/components/omnibox_strings.grdp b/components/omnibox_strings.grdp
index 4779242..8a052c8 100644
--- a/components/omnibox_strings.grdp
+++ b/components/omnibox_strings.grdp
@@ -55,6 +55,9 @@
   <message name="IDS_PHYSICAL_WEB_OVERFLOW_EMPTY_TITLE" desc="A label in the omnibox dropdown indicating the number of additional nearby devices broadcasting URLs. This version is used when the title of the top result is empty.">
     {URL_count, plural, =1 {1 web page nearby} other {# web pages nearby}}
   </message>
+  <message name="IDS_OMNIBOX_FILE" desc="Text shown in the omnibox to indicate a user is viewing a file.">
+    File
+  </message>
 
   <!-- Accessibility labels for autocomplete match types.
        These are parameterized on the text being completed into the omnibox.