Fixed comment about SkLightingShader::Context memory handling

src/core/SkLightingShader.cpp

Index: src/core/SkLightingShader.cpp
diff --git a/src/core/SkLightingShader.cpp b/src/core/SkLightingShader.cpp
index e35ede3a177ddb7685df58e503ef7271d2e37b0a..e8280b1267439e5405e835adb0e279742d00c12a 100644
--- a/src/core/SkLightingShader.cpp
+++ b/src/core/SkLightingShader.cpp
@@ -58,8 +58,8 @@ public:
 
     class LightingShaderContext : public SkShader::Context {
     public:
-        // The context takes ownership of the states. It will call their destructors
-        // but will NOT free the memory.
+        // The context takes ownership of the context and provider. It will call their destructors
+        // and then indirectly free their memory by calling free() on heapAllocated
         LightingShaderContext(const SkLightingShaderImpl&, const ContextRec&,
                               SkShader::Context* diffuseContext, SkNormalSource::Provider*,
                               void* heapAllocated);