Move gpu blacklist data file to content side.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
===================================================================
--- content/public/common/content_switches.cc	(revision 156701)
+++ content/public/common/content_switches.cc	(working copy)
@@ -444,6 +444,9 @@
 // to run as a guest renderer instead of a regular renderer.
 const char kGuestRenderer[]                 = "guest-renderer";
 
+// Ignores GPU blacklist.
+const char kIgnoreGpuBlacklist[]            = "ignore-gpu-blacklist";
+
 // Run the GPU process as a thread in the browser process.
 const char kInProcessGPU[]                  = "in-process-gpu";