Revert of Work around for nexus 6 TexSubImage issue

include/gpu/GrContextOptions.h

Index: include/gpu/GrContextOptions.h
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index 95b153fe61d0b694fa8dbe6ebfc79a7f014728a5..057bc83d19b06687c24000703010f0b7fadf8983 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -17,8 +17,7 @@
         , fMaxTextureSizeOverride(SK_MaxS32)
         , fMinTextureSizeOverride(0)
         , fSuppressDualSourceBlending(false)
-        , fGeometryBufferMapThreshold(-1)
-        , fUseDrawInsteadOfPartialTextureWrite(false) {}
+        , fGeometryBufferMapThreshold(-1) {}
 
     // EXPERIMENTAL
     // May be removed in the future, or may become standard depending
@@ -40,9 +39,6 @@
         buffers to CPU memory in order to update them.  A value of -1 means the GrContext should
         deduce the optimal value for this platform. */
     int  fGeometryBufferMapThreshold;
-
-    /** some gpus have problems with partial texture writes */
-    bool fUseDrawInsteadOfPartialTextureWrite;
 };
 
 #endif