Replace OStream with std::ostream.

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_H_
 #define V8_HYDROGEN_H_
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 197 matching lines @@
   // For blocks marked as inline return target: the block with HEnterInlined.
   HBasicBlock* inlined_entry_block_;
   bool is_inline_return_target_ : 1;
   bool is_reachable_ : 1;
   bool dominates_loop_successors_ : 1;
   bool is_osr_entry_ : 1;
   bool is_ordered_ : 1;
 };
 
 
-OStream& operator<<(OStream& os, const HBasicBlock& b);
+std::ostream& operator<<(std::ostream& os, const HBasicBlock& b);
 
 
 class HPredecessorIterator FINAL BASE_EMBEDDED {
  public:
   explicit HPredecessorIterator(HBasicBlock* block)
       : predecessor_list_(block->predecessors()), current_(0) { }
 
   bool Done() { return current_ >= predecessor_list_->length(); }
   HBasicBlock* Current() { return predecessor_list_->at(current_); }
   void Advance() { current_++; }
@@ skipping 507 matching lines @@
   int local_count_;
   HEnvironment* outer_;
   HEnterInlined* entry_;
   int pop_count_;
   int push_count_;
   BailoutId ast_id_;
   Zone* zone_;
 };
 
 
-OStream& operator<<(OStream& os, const HEnvironment& env);
+std::ostream& operator<<(std::ostream& os, const HEnvironment& env);
 
 
 class HOptimizedGraphBuilder;
 
 enum ArgumentsAllowedFlag {
   ARGUMENTS_NOT_ALLOWED,
   ARGUMENTS_ALLOWED
 };
 
 
@@ skipping 2152 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_