Move chrome.fileSystem implementation to //extensions

extensions/browser/api/file_system/BUILD.gn

Index: extensions/browser/api/file_system/BUILD.gn
diff --git a/extensions/browser/api/file_system/BUILD.gn b/extensions/browser/api/file_system/BUILD.gn
index 0e5fa0b4f254191a3d3a173d0bf80f9b515c6aed..a352c4832a41919f627782293ad7339cc27223eb 100644
--- a/extensions/browser/api/file_system/BUILD.gn
+++ b/extensions/browser/api/file_system/BUILD.gn
@@ -9,12 +9,28 @@ assert(enable_extensions,
 
 source_set("file_system") {
   sources = [
+    "file_system_api.cc",
+    "file_system_api.h",
+    "file_system_delegate.h",
     "saved_file_entry.cc",
     "saved_file_entry.h",
     "saved_files_service_interface.h",
   ]
 
   deps = [
-    "//base:base",
+    "//base",
+    "//content/public/browser",
+    "//extensions/browser/api/file_handlers",
+    "//extensions/common",
+    "//extensions/common/api",
+    "//net",
+    "//storage/browser",
+    "//storage/common",
+    "//ui/base",
+    "//ui/shell_dialogs",
+  ]
+
+  public_deps = [
+    "//extensions/browser:browser_sources",
   ]
 }