Fix gyp compile failures caused by moving broadcastchannel code.

I don't understand how gyp works with mojo bindings, but this seems to
fix some compile failures introduced in https://codereview.chromium.org/2158913006

BUG=630666

Review-Url: https://codereview.chromium.org/2173883003
Cr-Commit-Position: refs/heads/master@{#407286}

third_party/WebKit/Source/platform/blink_platform.gyp

@@ -162,7 +162,7 @@
       '<(DEPTH)/ui/gfx/gfx.gyp:gfx',
       '<(DEPTH)/ui/gfx/gfx.gyp:gfx_geometry',
       '<(DEPTH)/url/url.gyp:url_lib',
-      '<(DEPTH)/url/url.gyp:url_interfaces_mojom_for_blink',
+      '<(DEPTH)/url/url.gyp:url_mojom_for_blink',
       '<(DEPTH)/v8/src/v8.gyp:v8',
       '<(libjpeg_gyp_path):libjpeg',
     ],