Content "gn check" work.

content/shell/BUILD.gn

Index: content/shell/BUILD.gn
diff --git a/content/shell/BUILD.gn b/content/shell/BUILD.gn
index 6ce50f8645cce4fd1c75902e94f02001e570063f..865931d0f3fd191c178a6e879a3b84c010d37e05 100644
--- a/content/shell/BUILD.gn
+++ b/content/shell/BUILD.gn
@@ -221,12 +221,14 @@ static_library("content_shell_lib") {
     "//content/app/strings",
     "//content/gpu",
     "//content/test:layouttest_support",
+    "//content/test:test_support",
     "//device/bluetooth",
     "//device/bluetooth:mocks",
     "//gin",
     "//gpu",
     "//ipc",
     "//media",
+    "//media/mojo/services:application_factory",
     "//net",
     "//net:net_resources",
     "//skia",
@@ -255,6 +257,7 @@ static_library("content_shell_lib") {
       "//content/ppapi_plugin",
       "//ppapi:blink_deprecated_test_plugin",
       "//ppapi:blink_test_plugin",
+      "//ppapi/shared_impl",
     ]
   }
   if (mojo_media_host == "browser") {
@@ -270,7 +273,10 @@ static_library("content_shell_lib") {
   }
 
   if (is_linux) {
-    deps += [ "//build/linux:fontconfig" ]
+    deps += [
+      "//build/linux:fontconfig",
+      "//ui/gfx:test_support",
+    ]
   }
 
   if (use_x11) {
@@ -289,7 +295,10 @@ static_library("content_shell_lib") {
   }
 
   if (is_posix && !is_mac) {
-    deps += [ "//components/crash/content/browser" ]
+    deps += [
+      "//components/crash/content/app",
+      "//components/crash/content/browser",
+    ]
   }
 
   if (use_aura) {
@@ -308,6 +317,7 @@ static_library("content_shell_lib") {
         "//ui/views",
         "//ui/views:test_support",
         "//ui/views/controls/webview",
+        "//ui/wm:test_support",
       ]
     } else {
       sources += [ "browser/shell_aura.cc" ]