Use full type names instead of auto for simple structs.

BUG=angleproject:2107

Change-Id: I7a5e4be124ec4381799fea51de3715e09c2f7400
Reviewed-on: https://chromium-review.googlesource.com/957272
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/Framebuffer.cpp b/src/libANGLE/Framebuffer.cpp
index 9d83832..8d13266 100644
--- a/src/libANGLE/Framebuffer.cpp
+++ b/src/libANGLE/Framebuffer.cpp
@@ -1949,8 +1949,8 @@
         return NoError();
     }
 
-    const auto &blend        = glState.getBlendState();
-    const auto &depthStencil = glState.getDepthStencilState();
+    const BlendState &blend               = glState.getBlendState();
+    const DepthStencilState &depthStencil = glState.getDepthStencilState();
 
     bool color   = (mask & GL_COLOR_BUFFER_BIT) != 0 && !IsColorMaskedOut(blend);
     bool depth   = (mask & GL_DEPTH_BUFFER_BIT) != 0 && !IsDepthMaskedOut(depthStencil);