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

content/renderer/BUILD.gn

Index: content/renderer/BUILD.gn
diff --git a/content/renderer/BUILD.gn b/content/renderer/BUILD.gn
index e4fe139b83bccf6c6dcf62f0ad55dcf105c34e23..ec8127d5c539e6fb16a70375562cc96b9f839d82 100644
--- a/content/renderer/BUILD.gn
+++ b/content/renderer/BUILD.gn
@@ -7,6 +7,7 @@ import("//build/config/ui.gni")
 import("//content/renderer/renderer.gni")
 import("//media/media_options.gni")
 import("//third_party/webrtc/build/webrtc.gni")
+import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 source_set("renderer") {
   # Only the public target should depend on this. All other targets (even
@@ -248,6 +249,10 @@ source_set("renderer") {
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
+
+  if (enable_ipc_fuzzer) {
+    configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_config" ]
+  }
 }
 
 # See comment at the top of //content/BUILD.gn for how this works.