Revert "Implement GL_KHR_debug."

This reverts commit 6c521b7a70a53b1c9f7762e53e34b5a8146b0f7b.

Change-Id: I6ff981198e31f34d3e405edea6277ee75516d6ee
Reviewed-on: https://chromium-review.googlesource.com/319820
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/VertexArray.cpp b/src/libANGLE/VertexArray.cpp
index 8d51e9b..afa4332 100644
--- a/src/libANGLE/VertexArray.cpp
+++ b/src/libANGLE/VertexArray.cpp
@@ -15,7 +15,8 @@
 {
 
 VertexArray::Data::Data(size_t maxAttribs)
-    : mLabel(), mVertexAttributes(maxAttribs), mMaxEnabledAttribute(0)
+    : mVertexAttributes(maxAttribs),
+      mMaxEnabledAttribute(0)
 {
 }
 
@@ -45,16 +46,6 @@
     return mId;
 }
 
-void VertexArray::setLabel(const std::string &label)
-{
-    mData.mLabel = label;
-}
-
-const std::string &VertexArray::getLabel() const
-{
-    return mData.mLabel;
-}
-
 void VertexArray::detachBuffer(GLuint bufferName)
 {
     for (size_t attribute = 0; attribute < getMaxAttribs(); attribute++)