Move V8ValueConverter from content/renderer to content/child.

This will be used by changes in content/child/webmessageportchannel_impl.cc
in a future CL to enable conversions between v8::Value and base::Value.

BUG=426458

Review URL: https://codereview.chromium.org/921543002

Cr-Commit-Position: refs/heads/master@{#316117}
diff --git a/extensions/renderer/script_injection.cc b/extensions/renderer/script_injection.cc
index ea588fe..9f3236f 100644
--- a/extensions/renderer/script_injection.cc
+++ b/extensions/renderer/script_injection.cc
@@ -10,8 +10,8 @@
 #include "base/metrics/histogram.h"
 #include "base/timer/elapsed_timer.h"
 #include "base/values.h"
+#include "content/public/child/v8_value_converter.h"
 #include "content/public/renderer/render_view.h"
-#include "content/public/renderer/v8_value_converter.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/feature_switch.h"