Start cleaning up 64bit Win warnings

src/core/SkRTree.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRTree.h"
 #include "SkTSort.h"
 
@@ skipping 388 matching lines @@
         branches->setCount(newBranches);
         return this->bulkLoad(branches, level + 1);
     }
 }
 
 void SkRTree::validate() {
 #ifdef SK_DEBUG
     if (this->isEmpty()) {
         return;
     }
-    SkASSERT(fCount == (size_t)this->validateSubtree(fRoot.fChild.subtree, fRoot.fBounds, true));
+    SkASSERT(fCount == this->validateSubtree(fRoot.fChild.subtree, fRoot.fBounds, true));
 #endif
 }
 
 int SkRTree::validateSubtree(Node* root, SkIRect bounds, bool isRoot) {
     // make sure the pointer is pointing to a valid place
     SkASSERT(fNodes.contains(static_cast<void*>(root)));
 
     if (isRoot) {
         // If the root of this subtree is the overall root, we have looser standards:
         if (root->isLeaf()) {
@@ skipping 55 matching lines @@
 
 // Expand 'out' to include 'joinWith'
 static inline void join_no_empty_check(const SkIRect& joinWith, SkIRect* out) {
     // since we check for empty bounds on insert, we know we'll never have empty rects
     // and we can save the empty check that SkIRect::join requires
     if (joinWith.fLeft < out->fLeft) { out->fLeft = joinWith.fLeft; }
     if (joinWith.fTop < out->fTop) { out->fTop = joinWith.fTop; }
     if (joinWith.fRight > out->fRight) { out->fRight = joinWith.fRight; }
     if (joinWith.fBottom > out->fBottom) { out->fBottom = joinWith.fBottom; }
 }