Move content_shell dependency to data_deps for content_browsertests target.

Target "//content/shell:content_shell" added to deps blocked compiling
content_browsertests sources.

Bug: chromium:1164349
Change-Id: Id87106b2d3197c04d66fcb06e55d3421022249fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616226Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842273}

content/test/BUILD.gn

@@ -1563,10 +1563,8 @@ test("content_browsertests") {
       "../browser/site_per_process_mac_browsertest.mm",
       "../renderer/render_view_browsertest_mac.mm",
     ]
-    deps += [
-      "//content/shell:content_shell",
-      "//third_party/ocmock",
-    ]
+    deps += [ "//third_party/ocmock" ]
+    data_deps += [ "//content/shell:content_shell" ]
     data += [ "$root_out_dir/Content Shell.app/" ]
   }