Remove GYP annotations from chrome, ui, tools GN files.

chrome/app/BUILD.gn

Index: chrome/app/BUILD.gn
diff --git a/chrome/app/BUILD.gn b/chrome/app/BUILD.gn
index 561037271f62c8367c48a0959a2a8c691eeace9e..11b2412ab5bd364f62fa023e572140549349b527 100644
--- a/chrome/app/BUILD.gn
+++ b/chrome/app/BUILD.gn
@@ -63,8 +63,6 @@ if (is_android) {
   ]
 }
 
-# GYP version: chrome/chrome_resources.gyp:chrome_strings
-#              (generate_generated_resources action)
 grit("generated_resources") {
   source = "generated_resources.grd"
   use_qualified_include = true
@@ -143,8 +141,6 @@ if (is_android) {
   }
 }
 
-# GYP version: chrome/chrome_resources.gyp:chrome_strings
-#              (generate_google_chrome_strings action)
 grit("google_chrome_strings") {
   source = "google_chrome_strings.grd"
   use_qualified_include = true
@@ -208,8 +204,6 @@ grit("google_chrome_strings") {
   ]
 }
 
-# GYP version: chrome/chrome_resources.gyp:chrome_strings
-#              (generate_chromium_strings action)
 grit("chromium_strings") {
   source = "chromium_strings.grd"
   use_qualified_include = true