Move IPC fuzzer switches and helpers from chrome/common to content/common.

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index dbea5bbf93e400f6d0fa8ef9808700db90d88013..5d6d88f8799f592809e0d4cea364ad31add6c364 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -6,6 +6,7 @@ import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/browser/browser.gni")
 import("//media/media_options.gni")
+import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 source_set("browser") {
   # Only the public target should depend on this. All other targets (even
@@ -515,6 +516,10 @@ source_set("browser") {
   if (enable_webvr) {
     deps += [ "//device/vr" ]
   }
+
+  if (enable_ipc_fuzzer) {
+    configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_config" ]
+  }
 }
 
 # See comment at the top of //content/BUILD.gn for how this works.