content: Move shader cache factory singleton into a separate file.

content/browser/gpu/browser_gpu_channel_host_factory.cc

Index: content/browser/gpu/browser_gpu_channel_host_factory.cc
diff --git a/content/browser/gpu/browser_gpu_channel_host_factory.cc b/content/browser/gpu/browser_gpu_channel_host_factory.cc
index 601a4a6c6e4c6e3a93760b7f5bff3c1c82d7bb4e..b9876e88fc117395ce1d11f1fe86f5e36836822f 100644
--- a/content/browser/gpu/browser_gpu_channel_host_factory.cc
+++ b/content/browser/gpu/browser_gpu_channel_host_factory.cc
@@ -18,7 +18,7 @@
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
-#include "content/browser/gpu/shader_disk_cache.h"
+#include "content/browser/gpu/shader_cache_factory.h"
 #include "content/common/child_process_host_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
@@ -371,7 +371,7 @@ void BrowserGpuChannelHostFactory::AddFilterOnIO(
 void BrowserGpuChannelHostFactory::InitializeShaderDiskCacheOnIO(
     int gpu_client_id,
     const base::FilePath& cache_dir) {
-  ShaderCacheFactory::GetInstance()->SetCacheInfo(gpu_client_id, cache_dir);
+  GetShaderCacheFactorySingleton()->SetCacheInfo(gpu_client_id, cache_dir);
 }
 
 }  // namespace content