Revert "change SkColorTable to be immutable"

This reverts commit 1c0ff422868b3badf5ffe0790a5d051d1896e2f7.

BUG=

Review URL: https://codereview.chromium.org/26709002

git-svn-id: http://skia.googlecode.com/svn/trunk@11677 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index 0b60ede..7505d75 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -31,7 +31,7 @@
     char* dst = (char*)buffer;
 
     memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
-    ctable->unlockColors();
+    ctable->unlockColors(false);
 
     // always skip a full 256 number of entries, even if we memcpy'd fewer
     dst += kGrColorTableSize;