Do not preload data URIs.

Source/core/html/parser/HTMLResourcePreloader.cpp

Index: Source/core/html/parser/HTMLResourcePreloader.cpp
diff --git a/Source/core/html/parser/HTMLResourcePreloader.cpp b/Source/core/html/parser/HTMLResourcePreloader.cpp
index 0a59075066c9afd61f0796e9b141ea5a446bf475..ab7ef5f8bb9d010183239312f93d6a7b260e2037 100644
--- a/Source/core/html/parser/HTMLResourcePreloader.cpp
+++ b/Source/core/html/parser/HTMLResourcePreloader.cpp
@@ -77,6 +77,8 @@ void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
     if (!m_document->loader())
         return;
     FetchRequest request = preload->resourceRequest(m_document);
+    if (preload->resourceType() == Resource::Image && request.url().protocolIsData())

[Yoav Weiss, 2015/06/25 10:21:30]

I wouldn't block that on images only. It makes no sense to do that for any kind
of resource

+        return;
     if (preload->resourceType() == Resource::Script || preload->resourceType() == Resource::CSSStyleSheet || preload->resourceType() == Resource::ImportResource)
         request.setCharset(preload->charset().isEmpty() ? m_document->charset().string() : preload->charset());
     request.setForPreload(true);