Don't share renderers between unrelated tabs on Android.

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index b33a5b325dc7c4e9d45dd04d59be60d050cfb4a7..2c0f2cbb8a22b581bfc94d350083156b7eac11d3 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -286,8 +286,8 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // A value of zero means to use the default heuristic.
   static void SetMaxRendererProcessCount(size_t count);
 
-  // Returns the current max number of renderer processes used by the content
-  // module.
+  // Returns the current maximum number of renderer process hosts kept by the
+  // content module or 0 if don't maintain such limit (e.g. on Android).
   static size_t GetMaxRendererProcessCount();
 };