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

chrome/common/BUILD.gn

Index: chrome/common/BUILD.gn
diff --git a/chrome/common/BUILD.gn b/chrome/common/BUILD.gn
index 189b3cd944f886932cf4daef7d62627da00d30d1..bff72ad48349ffa5692883d4267712d8b010d93b 100644
--- a/chrome/common/BUILD.gn
+++ b/chrome/common/BUILD.gn
@@ -7,7 +7,6 @@ import("//chrome/common/features.gni")
 import("//chrome/version.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
-import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_common.gypi") ],
@@ -294,14 +293,6 @@ static_library("common") {
                       "//chrome")
     }
   }
-
-  if (enable_ipc_fuzzer) {
-    configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_config" ]
-    sources += [
-      "external_ipc_dumper.cc",
-      "external_ipc_dumper.h",
-    ]
-  }
 }
 
 # GYP version: chrome/common_constants.gyp:version_header
@@ -371,10 +362,6 @@ static_library("constants") {
     # implemented in //ui/base, so we need that dependency.
     deps += [ "//ui/base" ]
   }
-
-  if (enable_ipc_fuzzer) {
-    configs += [ "//tools/ipc_fuzzer:ipc_fuzzer_config" ]
-  }
 }
 
 if (is_win) {