DevTools: android shouldn't depend on devtools frontend

content/public/browser/BUILD.gn

Index: content/public/browser/BUILD.gn
diff --git a/content/public/browser/BUILD.gn b/content/public/browser/BUILD.gn
index 4eb12814c823923bbe8f2d6744725fba3010d909..e5bb50d1a89311a615415f5855853d0f3d2d824c 100644
--- a/content/public/browser/BUILD.gn
+++ b/content/public/browser/BUILD.gn
@@ -92,7 +92,6 @@ source_set("browser_sources") {
     "devtools_agent_host_observer.h",
     "devtools_external_agent_proxy.h",
     "devtools_external_agent_proxy_delegate.h",
-    "devtools_frontend_host.h",
     "devtools_manager_delegate.cc",
     "devtools_manager_delegate.h",
     "devtools_socket_factory.h",
@@ -329,4 +328,8 @@ source_set("browser_sources") {
     sources -= [ "context_factory.h" ]
     deps += [ "//ui/aura" ]
   }
+
+  if (!is_android) {
+    sources += [ "devtools_frontend_host.h" ]
+  }
 }