Remove mojom_broadcastchannel_bindings dependency on from content_browsertests

It's already exported from content.dll. Trying to link it in twice
causes duplicate definition error when building with the latest Clang.

Bug: 1138934
Change-Id: I7440362ab7b8c3fe4debe0e3aba623c48e94a92d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480822
Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818011}

content/browser/BUILD.gn

@@ -208,7 +208,6 @@ source_set("browser") {
     "//third_party/blink/public:scaled_resources",
     "//third_party/blink/public/common",
     "//third_party/blink/public/common:font_enumeration_table_proto",
-    "//third_party/blink/public/mojom:mojom_broadcastchannel_bindings",
     "//third_party/blink/public/mojom/dom_storage",
     "//third_party/blink/public/mojom/frame",
     "//third_party/blink/public/strings",
@@ -261,6 +260,7 @@ source_set("browser") {
     "//ipc",
     "//media/mojo/mojom:remoting",
     "//third_party/blink/public/mojom:embedded_frame_sink_mojo_bindings",
+    "//third_party/blink/public/mojom:mojom_broadcastchannel_bindings",
     "//third_party/leveldatabase",
   ]
 

content/test/BUILD.gn

@@ -1296,7 +1296,6 @@ test("content_browsertests") {
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/blink/public:blink",
-    "//third_party/blink/public/mojom:mojom_broadcastchannel_bindings",
     "//third_party/blink/public/mojom/frame",
     "//third_party/leveldatabase",
     "//third_party/mesa_headers",