Reland "Add flag for #omnibox-deduplicate-drive-urls"

This is a reland of 703661c8155e5f1a0370fa56fa133f24c36de0d8

Original change's description:
> Add flag for #omnibox-deduplicate-drive-urls
> 
> Change-Id: I48b82707892caa2ed85ab776b6cae73274382fde
> Reviewed-on: https://chromium-review.googlesource.com/c/1481121
> Commit-Queue: Travis Skare <[email protected]>
> Reviewed-by: Justin Donnelly <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#634850}

Change-Id: I3551f9b6216795713d7435d534d8b6cebbb9370b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1484857
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Justin Donnelly <[email protected]>
Commit-Queue: Travis Skare <[email protected]>
Cr-Commit-Position: refs/heads/master@{#638270}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 009c1b1..99900f07 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2696,6 +2696,10 @@
      flag_descriptions::kOmniboxDriveSuggestionsName,
      flag_descriptions::kOmniboxDriveSuggestionsDescriptions, kOsDesktop,
      FEATURE_VALUE_TYPE(omnibox::kDocumentProvider)},
+    {"omnibox-deduplicate-drive-urls",
+     flag_descriptions::kOmniboxDeduplicateDriveUrlsName,
+     flag_descriptions::kOmniboxDeduplicateDriveUrlsDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(omnibox::kDedupeGoogleDriveURLs)},
 #endif  // defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
 
     {"enable-speculative-service-worker-start-on-query-input",