Revert 266932 "GN build improvements."

> GN build improvements.
> 
> Fixes a TODO about private symbols on GCC.
> 
> Moves many third party BUILD.gn files from the secondary tree to the main one.
> 
> Fixes the dependencies on Linux so "gn check" passes again.
> 
> BUG=367595
> R=scottmg@chromium.org
> 
> Review URL: https://codereview.chromium.org/256153003

TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/257243003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266933 0039d316-1c4b-4281-b951-d872f2087c98

components/translate/BUILD.gn

@@ -33,9 +33,7 @@ static_library("translate_core_browser") {
   deps = [
     ":translate_core_common",
     "//base",
-    "//components/language_usage_metrics",
     "//components/resources:components_resources",
-    "//net",
     "//url",
   ]
 }

net/third_party/nss/ssl/BUILD.gn

@@ -118,8 +118,8 @@ component("libssl") {
     forward_dependent_configs_from = deps
   }
 
-  if (!is_win && component_mode == "shared_library") {
-    configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
+  if (component_mode == "shared_library") {
+    # TODO(brettw) GCC_SYMBOLS_PRIVATE_EXTERN thing.
   }
 
   if (is_clang) {

third_party/expat/BUILD.gn → tools/gn/secondary/third_party/expat/BUILD.gn

@@ -11,7 +11,7 @@ if (is_linux) {
     direct_dependent_configs = [ ":expat_config" ]
   }
 
-  # TODO(GYP) Android needs direct dependent includes of
+  # TODO(brettw) Android needs direct dependent includes of
   # <android_src>/external/expat/lib
 } else {
   config("expat_config") {

ui/events/BUILD.gn

@@ -41,7 +41,6 @@ component("events_base") {
     ":dom4_keycode_converter",
     "//base",
     "//base/third_party/dynamic_annotations",
-    "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 

ui/gfx/BUILD.gn

@@ -456,10 +456,5 @@ if (use_x11) {
     ]
 
     configs += [ "//build/config/linux:x11" ]
-
-    deps = [
-      ":gfx_export",
-      "//base"
-    ]
   }
 }