Update {virtual,override} to follow C++11 style in content.

content/child/npapi/plugin_url_fetcher.cc

Index: content/child/npapi/plugin_url_fetcher.cc
diff --git a/content/child/npapi/plugin_url_fetcher.cc b/content/child/npapi/plugin_url_fetcher.cc
index 372c3b580039147ded2ebd4b9fe11c90c3675c0c..b4ef6772913b62c5b59820ecf47ad3f4916d47ad 100644
--- a/content/child/npapi/plugin_url_fetcher.cc
+++ b/content/child/npapi/plugin_url_fetcher.cc
@@ -43,9 +43,8 @@ class MultiPartResponseClient : public blink::WebURLLoaderClient {
       : byte_range_lower_bound_(0), plugin_stream_(plugin_stream) {}
 
   // blink::WebURLLoaderClient implementation:
-  virtual void didReceiveResponse(
-      blink::WebURLLoader* loader,
-      const blink::WebURLResponse& response) override {
+  void didReceiveResponse(blink::WebURLLoader* loader,
+                          const blink::WebURLResponse& response) override {
     int64 byte_range_upper_bound, instance_size;
     if (!MultipartResponseDelegate::ReadContentRanges(response,
                                                       &byte_range_lower_bound_,
@@ -54,10 +53,10 @@ class MultiPartResponseClient : public blink::WebURLLoaderClient {
       NOTREACHED();
     }
   }
-  virtual void didReceiveData(blink::WebURLLoader* loader,
-                              const char* data,
-                              int data_length,
-                              int encoded_data_length) override {
+  void didReceiveData(blink::WebURLLoader* loader,
+                      const char* data,
+                      int data_length,
+                      int encoded_data_length) override {
     // TODO(ananta)
     // We should defer further loads on multipart resources on the same lines
     // as regular resources requested by plugins to prevent reentrancy.