Allow application/pdf mime type plugins in Blink unit tests.

content/test/test_blink_web_unit_test_support.cc

Index: content/test/test_blink_web_unit_test_support.cc
diff --git a/content/test/test_blink_web_unit_test_support.cc b/content/test/test_blink_web_unit_test_support.cc
index 05a6b9bcce2fec1c48d896fbe7d74c177ba377f5..52b24606ca3747e63b9f5b55938654fc1a1c4b3d 100644
--- a/content/test/test_blink_web_unit_test_support.cc
+++ b/content/test/test_blink_web_unit_test_support.cc
@@ -25,6 +25,7 @@
 #include "storage/browser/database/vfs_backend.h"
 #include "third_party/WebKit/public/platform/WebData.h"
 #include "third_party/WebKit/public/platform/WebFileSystem.h"
+#include "third_party/WebKit/public/platform/WebPluginListBuilder.h"
 #include "third_party/WebKit/public/platform/WebStorageArea.h"
 #include "third_party/WebKit/public/platform/WebStorageNamespace.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ -380,4 +381,10 @@ void TestBlinkWebUnitTestSupport::exitRunLoop() {
   base::MessageLoop::current()->Quit();
 }
 
+void TestBlinkWebUnitTestSupport::getPluginList(
+    bool refresh, blink::WebPluginListBuilder* builder) {
+  builder->addPlugin("pdf", "pdf", "pdf-files");
+  builder->addMediaTypeToLastPlugin("application/pdf", "pdf");
+}
+
 }  // namespace content