Rollback text allocation changes.

This also addresses an inadvertantly introduced distance field bug.

BUG=399125
R=bsalomon@google.com

Author: jvanverth@google.com

Review URL: https://codereview.chromium.org/438683006
diff --git a/src/gpu/GrDistanceFieldTextContext.h b/src/gpu/GrDistanceFieldTextContext.h
index fa0a76b..75a13b3 100644
--- a/src/gpu/GrDistanceFieldTextContext.h
+++ b/src/gpu/GrDistanceFieldTextContext.h
@@ -55,6 +55,8 @@
     };
 
     void*                   fVertices;
+    int32_t                 fMaxVertices;
+    GrTexture*              fCurrTexture;
     int                     fCurrVertex;
     SkRect                  fVertexBounds;
 };