tools/gn: rename char_offset to column_number

tools/gn/input_conversion_unittest.cc

 // Copyright (c) 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 "testing/gtest/include/gtest/gtest.h"
 #include "tools/gn/err.h"
 #include "tools/gn/input_conversion.h"
 #include "tools/gn/input_file.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scheduler.h"
@@ skipping 108 matching lines @@
   const Value* c_value = result.scope_value()->GetValue("c");
   ASSERT_TRUE(c_value);
   EXPECT_EQ(7, c_value->int_value());
 
   // Tests that when we get Values out of the input conversion, the resulting
   // values have an origin set to something corresponding to the input.
   const ParseNode* a_origin = a_value->origin();
   ASSERT_TRUE(a_origin);
   LocationRange a_range = a_origin->GetRange();
   EXPECT_EQ(2, a_range.begin().line_number());
-  EXPECT_EQ(6, a_range.begin().char_offset());
+  EXPECT_EQ(6, a_range.begin().column_number());
 
   const InputFile* a_file = a_range.begin().file();
   EXPECT_EQ(input, a_file->contents());
 }
 
 TEST_F(InputConversionTest, ValueEmpty) {
   Err err;
   Value result = ConvertInputToValue(settings(), "", nullptr,
                                      Value(nullptr, "value"), &err);
   EXPECT_FALSE(err.has_error());
@@ skipping 33 matching lines @@
   Err err;
   Value result = ConvertInputToValue(settings(), "foo", nullptr, Value(), &err);
   EXPECT_FALSE(err.has_error());
   EXPECT_EQ(Value::NONE, result.type());
 
   result =
       ConvertInputToValue(settings(), "foo", nullptr, Value(nullptr, ""), &err);
   EXPECT_FALSE(err.has_error());
   EXPECT_EQ(Value::NONE, result.type());
 }