[WebApps] Moves the Minimal-UI flag from android directory to common.

As it needs to be used in installable manager, which is common to all
platforms.

Bug: 604390
Change-Id: I5983d91bc4ccbbce7a011317e2a0d36e540eaf04
Reviewed-on: https://chromium-review.googlesource.com/611840
Commit-Queue: Piotr Swigon <[email protected]>
Reviewed-by: Dominick Ng <[email protected]>
Cr-Commit-Position: refs/heads/master@{#493682}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 0429a755..0d6c1c459 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3342,11 +3342,9 @@
      FEATURE_VALUE_TYPE(features::kVoiceSearchOnLocalNtp)},
 #endif  // !defined(OS_ANDROID)
 
-#if defined(OS_ANDROID)
     {"pwa-minimal-ui", flag_descriptions::kPwaMinimalUiName,
      flag_descriptions::kPwaMinimalUiDescription, kOsAndroid,
-     FEATURE_VALUE_TYPE(chrome::android::kPwaMinimalUi)},
-#endif  // OS_ANDROID
+     FEATURE_VALUE_TYPE(features::kPwaMinimalUi)},
 
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms/enums.xml. See note in