Update protobuf to r428, part 1.

third_party/protobuf/src/google/protobuf/repeated_field.cc

Index: third_party/protobuf/src/google/protobuf/repeated_field.cc
===================================================================
--- third_party/protobuf/src/google/protobuf/repeated_field.cc	(revision 216642)
+++ third_party/protobuf/src/google/protobuf/repeated_field.cc	(working copy)
@@ -46,42 +46,31 @@
   if (total_size_ >= new_size) return;
 
   void** old_elements = elements_;
-  total_size_ = max(total_size_ * 2, new_size);
+  total_size_ = max(kMinRepeatedFieldAllocationSize,
+                    max(total_size_ * 2, new_size));
   elements_ = new void*[total_size_];
-  memcpy(elements_, old_elements, allocated_size_ * sizeof(elements_[0]));
-  if (old_elements != initial_space_) {
+  if (old_elements != NULL) {
+    memcpy(elements_, old_elements, allocated_size_ * sizeof(elements_[0]));
     delete [] old_elements;
   }
 }
 
 void RepeatedPtrFieldBase::Swap(RepeatedPtrFieldBase* other) {
+  if (this == other) return;
   void** swap_elements       = elements_;
   int    swap_current_size   = current_size_;
   int    swap_allocated_size = allocated_size_;
   int    swap_total_size     = total_size_;
-  // We may not be using initial_space_ but it's not worth checking.  Just
-  // copy it anyway.
-  void* swap_initial_space[kInitialSize];
-  memcpy(swap_initial_space, initial_space_, sizeof(initial_space_));
 
   elements_       = other->elements_;
   current_size_   = other->current_size_;
   allocated_size_ = other->allocated_size_;
   total_size_     = other->total_size_;
-  memcpy(initial_space_, other->initial_space_, sizeof(initial_space_));
 
   other->elements_       = swap_elements;
   other->current_size_   = swap_current_size;
   other->allocated_size_ = swap_allocated_size;
   other->total_size_     = swap_total_size;
-  memcpy(other->initial_space_, swap_initial_space, sizeof(swap_initial_space));
-
-  if (elements_ == other->initial_space_) {
-    elements_ = initial_space_;
-  }
-  if (other->elements_ == initial_space_) {
-    other->elements_ = other->initial_space_;
-  }
 }
 
 string* StringTypeHandlerBase::New() {