[AW] Add some more restrictions to our DEPS files

This adds restrictions to //aw/gpu and ensures only //aw/browser can
depend on network_service.h. Other than these tweaks, the DEPS files
were in pretty good shape as-is and already enforced the main rules.

Bug: 934152
Change-Id: Id532610dd125e142a7796caeb605a1e50b2287a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954543Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722555}

android_webview/DEPS

@@ -30,7 +30,6 @@ include_rules = [
   "+media/media_buildflags.h",
   "+mojo/public/cpp/bindings",
   "+net",
-  "+services/network/network_service.h",
   "+services/network/public/cpp",
   "+services/preferences/tracked",
   "+services/service_manager/public",

android_webview/browser/DEPS

@@ -61,6 +61,7 @@ include_rules = [
   "+services/network/public",
   # This is needed for the CookieManager to configure the CookieStore directly.
   "+services/network/cookie_access_delegate_impl.h",
+  "+services/network/network_service.h",
   "+services/resource_coordinator/public/cpp",
   "+services/service_manager/public/cpp",
 

android_webview/gpu/DEPS

 include_rules = [
+  "-android_webview",
+  "+android_webview/common",
+  "+android_webview/common_jni_headers",
   "+content/public/gpu",
 ]