Add direct dependency on //url to //android_webview:common

It looks like aw_web_ui_controller_factory.cc was getting it's
dependency on GURL through
components/safe_browsing/web_ui/safe_browsing_ui.h. This CL makes the
dependency direct, so the Safe Browsing UI can change its dependencies
without breaking android_webview.

(For an example of a broken build from changing the Safe Browsing UI,
see crrev/c/1187008/1)

Change-Id: I5d94b567d473caf7655c1447fbc8ccd416d6b5b6
Reviewed-on: https://chromium-review.googlesource.com/1187186Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585627}

android_webview/BUILD.gn

@@ -787,6 +787,7 @@ source_set("common") {
     "//ui/gl",
     "//ui/gl/init",
     "//ui/shell_dialogs",
+    "//url",
     "//v8",
   ]
 

android_webview/browser/aw_web_ui_controller_factory.cc

@@ -8,6 +8,7 @@
 #include "components/safe_browsing/web_ui/constants.h"
 #include "components/safe_browsing/web_ui/safe_browsing_ui.h"
 #include "content/public/browser/web_ui.h"
+#include "url/gurl.h"
 
 using content::WebUI;
 using content::WebUIController;