Fix a bunch of generated file build flakes in //extensions

Several files in //extensions could randomly fail to build due to
missing dependencies on header generator targets, mostly mojo
and grit. Add the dependencies so builds are not flaky.

BUG=655123

Review-Url: https://codereview.chromium.org/2452943003
Cr-Commit-Position: refs/heads/master@{#429543}
diff --git a/chrome/browser/extensions/BUILD.gn b/chrome/browser/extensions/BUILD.gn
index 75beb66..38e14ff0 100644
--- a/chrome/browser/extensions/BUILD.gn
+++ b/chrome/browser/extensions/BUILD.gn
@@ -884,8 +884,8 @@
     "//device/hid",
     "//extensions:extensions_resources",
     "//extensions/browser",
+    "//extensions/browser/api:api_registration",
     "//extensions/common/api",
-    "//extensions/common/api:api_registration",
     "//extensions/strings",
     "//net",
     "//skia",