base::RefCounted now DCHECKs when referenced from multiple threads.

gpu/command_buffer/service/shader_translator_cache.h

Index: gpu/command_buffer/service/shader_translator_cache.h
diff --git a/gpu/command_buffer/service/shader_translator_cache.h b/gpu/command_buffer/service/shader_translator_cache.h
index 6b0b1a57ef35cfc3a727a8962db1af05803dbae3..ca7a5367b3f4118d1f49deb62b7cded65e5e402d 100644
--- a/gpu/command_buffer/service/shader_translator_cache.h
+++ b/gpu/command_buffer/service/shader_translator_cache.h
@@ -22,8 +22,9 @@ namespace gles2 {
 //
 // TODO(backer): Investigate using glReleaseShaderCompiler as an alternative to
 // to this cache.
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
 class GPU_EXPORT ShaderTranslatorCache
-    : public base::RefCounted<ShaderTranslatorCache>,
+    : public base::UnsafeRefCounted<ShaderTranslatorCache>,
       public NON_EXPORTED_BASE(ShaderTranslator::DestructionObserver) {
  public:
   ShaderTranslatorCache();
@@ -40,7 +41,7 @@ class GPU_EXPORT ShaderTranslatorCache
       ShCompileOptions driver_bug_workarounds);
 
  private:
-  friend class base::RefCounted<ShaderTranslatorCache>;
+  friend class base::UnsafeRefCounted<ShaderTranslatorCache>;
   friend class ShaderTranslatorCacheTest_InitParamComparable_Test;
   ~ShaderTranslatorCache() override;