Drop imports for build/config/features.gni from buildflags.gni files

These imports are not strictly needed and can be the source of
dependency cycles if certain GN/GNI files get imported in some
ways, so we better remove them and eliminate that friction.

Additionally, this change implies that we need to explicitly add
an import for brave/components/decentralized_dns/buildflags in
brave/browser/profiles/BUILD.gn now, since that file needs the
definitions for decentralized_dns that were previously being
imported via brave/components/tor/buildflags/buildflags.gni:

brave/browser/profiles/BUILD.gn
└─> brave/components/tor/buildflags/buildflags.gni
     └─> build/config/features.gni
          └─> build/config/chrome_build.gni
               └─> brave/build/config/brave_build.gni
                    └─> brave/net/sources.gni
                         └─> brave/components/decentralized_dns/buildflags/buildflags.gni

... but now that build/config/features.gni is no longer being
imported from brave/components/tor/buildflags/buildflags.gni, we
need to explicitly add the import to brave/browser/profiles/BUILD.gn
or we'll get a new gn check failure.

Resolves https://github.com/brave/brave-browser/issues/15171

browser/profiles/BUILD.gn

@@ -1,3 +1,4 @@
+import("//brave/components/decentralized_dns/buildflags/buildflags.gni")
 import("//brave/components/tor/buildflags/buildflags.gni")
 import("//components/gcm_driver/config.gni")
 

browser/translate/buildflags/buildflags.gni

@@ -1,5 +1,4 @@
 import("//brave/build/config.gni")
-import("//build/config/features.gni")
 import("//extensions/buildflags/buildflags.gni")
 
 declare_args() {

components/brave_ads/browser/buildflags/buildflags.gni

@@ -1,5 +1,4 @@
 import("//brave/components/brave_rewards/browser/buildflags/buildflags.gni")
-import("//build/config/features.gni")
 
 declare_args() {
   brave_ads_enabled =

components/brave_referrals/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   enable_brave_referrals = is_mac || is_linux || is_win || is_android
 }

components/brave_rewards/browser/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   brave_rewards_enabled = is_mac || is_linux || is_win || is_android
 }

components/brave_shields/browser/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   brave_stp_enabled = false
 }

components/brave_sync/buildflags/buildflags.gni

@@ -1,5 +1,4 @@
 import("//brave/build/config.gni")
-import("//build/config/features.gni")
 
 declare_args() {
   enable_brave_sync = true

components/brave_together/buildflags/buildflags.gni

@@ -1,5 +1,4 @@
 import("//brave/build/config.gni")
-import("//build/config/features.gni")
 
 declare_args() {
   brave_together_enabled = brave_channel == "nightly"

components/crypto_dot_com/browser/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   crypto_dot_com_enabled = is_mac || is_linux || is_win
 }

components/gemini/browser/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   gemini_enabled = is_mac || is_linux || is_win
 }

components/greaselion/browser/buildflags/buildflags.gni

@@ -1,4 +1,3 @@
-import("//build/config/features.gni")
 import("//extensions/buildflags/buildflags.gni")
 
 declare_args() {

components/ipfs/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   ipfs_enabled = !is_ios
 }

components/p3a/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   brave_p3a_enabled = true
 }

components/speedreader/buildflags.gni

@@ -1,5 +1,4 @@
 import("//brave/build/config.gni")
-import("//build/config/features.gni")
 
 declare_args() {
   enable_speedreader = !is_android

components/tor/buildflags/buildflags.gni

@@ -1,5 +1,3 @@
-import("//build/config/features.gni")
-
 declare_args() {
   enable_tor = !is_android
 }