Move Google3-specific stack limitation logic to template classes. Remove #ifdefs in other files.

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index e0ee801ecb2e1b49ddb773b50ade27b35ee2aaf6..187a3ca37a7a1e416f83c0846c421c0ec49f3fe6 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -286,12 +286,7 @@ bool GrContext::writeSurfacePixels(GrSurface* surface,
     }
 
     // temp buffer for doing sw premul conversion, if needed.
-#if defined(GOOGLE3)
-    // Stack frame size is limited in GOOGLE3.
-    SkAutoSTMalloc<48 * 48, uint32_t> tmpPixels(0);
-#else
     SkAutoSTMalloc<128 * 128, uint32_t> tmpPixels(0);
-#endif
     if (tempTexture) {
         SkAutoTUnref<const GrFragmentProcessor> fp;
         SkMatrix textureMatrix;