Disable breakpad in GN build.

Causes compile errors on Linux

TBR=jamesr

Review URL: https://codereview.chromium.org/331383005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278163 0039d316-1c4b-4281-b951-d872f2087c98

BUILD.gn

@@ -102,7 +102,8 @@ group("root") {
   ]
 
   if (!is_win) {
-    deps += [ "//breakpad:symupload" ]
+    # TODO(brettw) re-enable once this compiles reliably.
+    #deps += [ "//breakpad:symupload" ]
   }
 
   if (is_linux) {