Add a couple of linux-specific exports for the content component build.

content/browser/renderer_host/render_widget_host_view.h

Index: content/browser/renderer_host/render_widget_host_view.h
diff --git a/content/browser/renderer_host/render_widget_host_view.h b/content/browser/renderer_host/render_widget_host_view.h
index 7556525a034b7aa1dd5c81bbbd0969591dae8e2f..59b072d3d9bcf58ea6c53d72047a9637d67285bc 100644
--- a/content/browser/renderer_host/render_widget_host_view.h
+++ b/content/browser/renderer_host/render_widget_host_view.h
@@ -172,9 +172,9 @@ class RenderWidgetHostView {
   virtual void SetTooltipText(const string16& tooltip_text) = 0;
 
   // Notifies the View that the renderer text selection has changed.
-  virtual void SelectionChanged(const string16& text,
-                                size_t offset,
-                                const ui::Range& range);
+  CONTENT_EXPORT virtual void SelectionChanged(const string16& text,
+                                               size_t offset,
+                                               const ui::Range& range);
 
   // Notifies the View that the renderer selection bounds has changed.
   // |start_rect| and |end_rect| are the bounds end of the selection in the