Revert of Add support for glMapBufferRange. Use glMapBufferRange and glMapBufferSubData.

src/gpu/GrBufferAllocPool.cpp

Index: src/gpu/GrBufferAllocPool.cpp
diff --git a/src/gpu/GrBufferAllocPool.cpp b/src/gpu/GrBufferAllocPool.cpp
index 30d02d953e0b92567c3bd3d691bb986392367902..2dbf3eb283fb37ae40b1f6a54e08267d5e7e0048 100644
--- a/src/gpu/GrBufferAllocPool.cpp
+++ b/src/gpu/GrBufferAllocPool.cpp
@@ -303,7 +303,7 @@
     //      threshold (since we don't expect it is likely that we will see more vertex data)
     //      b) If the hint is not set we lock if the buffer size is greater than the threshold.
     bool attemptLock = block.fBuffer->isCPUBacked();
-    if (!attemptLock && GrDrawTargetCaps::kNone_MapFlags != fGpu->caps()->mapBufferFlags()) {
+    if (!attemptLock && fGpu->caps()->bufferLockSupport()) {
         if (fFrequentResetHint) {
             attemptLock = requestSize > GR_GEOM_BUFFER_LOCK_THRESHOLD;
         } else {
@@ -351,7 +351,7 @@
     SkASSERT(flushSize <= buffer->sizeInBytes());
     VALIDATE(true);
 
-    if (GrDrawTargetCaps::kNone_MapFlags != fGpu->caps()->mapBufferFlags() &&
+    if (fGpu->caps()->bufferLockSupport() &&
         flushSize > GR_GEOM_BUFFER_LOCK_THRESHOLD) {
         void* data = buffer->lock();
         if (NULL != data) {