[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h

Index: third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h
diff --git a/third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h b/third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h
index ba1d08047aa6bf3b268add30f6bc58fac0013ab4..fe30a4e9000c93599c31a38d751526ef2647384e 100644
--- a/third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h
+++ b/third_party/WebKit/Source/platform/inspector_protocol/ValueConversions.h
@@ -83,8 +83,8 @@ struct ValueConversions<double> {
 };
 
 template<>
-struct ValueConversions<String> {
-    static String parse(protocol::Value* value, ErrorSupport* errors)
+struct ValueConversions<InspectorProtocolConvenienceStringType> {
+    static InspectorProtocolConvenienceStringType parse(protocol::Value* value, ErrorSupport* errors)
     {
         String16 result;
         bool success = value ? value->asString(&result) : false;
@@ -93,7 +93,7 @@ struct ValueConversions<String> {
         return result;
     }
 
-    static std::unique_ptr<protocol::Value> serialize(const String& value)
+    static std::unique_ptr<protocol::Value> serialize(const InspectorProtocolConvenienceStringType& value)
     {
         return StringValue::create(value);
     }