Fix underspecified deps in content/public/browser

content_browser_client.h exposes a public dependency on generated
outputs from the //media/mojo/mojom target. This CL properly expresses
that dependency in GN.

Fixed: 1049140
Change-Id: Icabe78cf9bc4e784444495d72da1bfbe9b90df01
Tbr: jam@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2039172
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#738616}

content/public/browser/BUILD.gn

@@ -417,6 +417,7 @@ jumbo_source_set("browser_sources") {
     "//components/services/storage/public/mojom",
     "//content/public/common:common_sources",
     "//ipc",
+    "//media/mojo/mojom",
     "//media/mojo/mojom:remoting",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/system",