Revert of Revert of Add support for deleting non preceeding surrounding text in chrome.input.ime.deleteSurroundingText

chrome/browser/chromeos/input_method/input_method_engine.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/input_method/input_method_engine.h"
 
 #undef FocusIn
 #undef FocusOut
 #undef RootWindow
 #include <map>
@@ skipping 480 matching lines @@
                                               std::string* error) {
   if (!IsActive()) {
     *error = kErrorNotActive;
     return false;
   }
   if (context_id != context_id_ || context_id_ == -1) {
     *error = kErrorWrongContext;
     return false;
   }
 
-  if (offset < 0 && static_cast<size_t>(-1 * offset) != size_t(number_of_chars))
-    return false;  // Currently we can only support preceding text.
-
   // TODO(nona): Return false if there is ongoing composition.
 
   IMEInputContextHandlerInterface* input_context =
       IMEBridge::Get()->GetInputContextHandler();
   if (input_context)
     input_context->DeleteSurroundingText(offset, number_of_chars);
 
   return true;
 }
 
@@ skipping 189 matching lines @@
           // TODO(nona): Implement it.
           break;
       }
     }
   }
 
   // TODO(nona): Support item.children.
 }
 
 }  // namespace chromeos