Remove dependency on GURL from content/common/gpu

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 27965a71fe39b3b8ccd29d86b1bd10fc26580ac5..9351342fa26ab020ee3afbeccf43a1cc061898ca 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -1038,11 +1038,8 @@ RendererBlinkPlatformImpl::createOffscreenGraphicsContext3D(
   bool lose_context_when_out_of_memory = false;
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context(
       WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
-          gpu_channel_host.get(),
-          attributes,
-          lose_context_when_out_of_memory,
-          blink::WebStringToGURL(attributes.topDocumentURL),
-          limits,
+          gpu_channel_host.get(), attributes, lose_context_when_out_of_memory,
+          attributes.topDocumentURL.utf8(), limits,
           static_cast<WebGraphicsContext3DCommandBufferImpl*>(share_context)));
 
   // Most likely the GPU process exited and the attempt to reconnect to it