Delete an unused field

this hasn't been used since CCToolchainProvider was made to
extend ToolchainInfo.

RELNOTES: None.
PiperOrigin-RevId: 232241997

src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainProvider.java

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainProvider.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainProvider.java
index 4593a15..a0ef445 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainProvider.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainProvider.java
@@ -49,7 +49,6 @@
 @AutoCodec
 public final class CcToolchainProvider extends ToolchainInfo
     implements CcToolchainProviderApi<FeatureConfiguration>, HasCcToolchainLabel {
-  public static final String SKYLARK_NAME = "CcToolchainInfo";
 
   /** An empty toolchain to be returned in the error case (instead of null). */
   public static final CcToolchainProvider EMPTY_TOOLCHAIN_IS_ERROR =