Remove Pickle::BeginWriteData/TrimWriteData, it's not used

base/pickle_unittest.cc

 // Copyright (c) 2012 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 <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/pickle.h"
 #include "base/strings/string16.h"
@@ skipping 40 matching lines @@
   float outfloat;
   EXPECT_TRUE(pickle.ReadFloat(&iter, &outfloat));
   EXPECT_EQ(testfloat, outfloat);
 
   const char* outdata;
   int outdatalen;
   EXPECT_TRUE(pickle.ReadData(&iter, &outdata, &outdatalen));
   EXPECT_EQ(testdatalen, outdatalen);
   EXPECT_EQ(memcmp(testdata, outdata, outdatalen), 0);
 
-  EXPECT_TRUE(pickle.ReadData(&iter, &outdata, &outdatalen));
-  EXPECT_EQ(testdatalen, outdatalen);
-  EXPECT_EQ(memcmp(testdata, outdata, outdatalen), 0);
-
   // reads past the end should fail
   EXPECT_FALSE(pickle.ReadInt(&iter, &outint));
 }
 
 }  // namespace
 
 TEST(PickleTest, EncodeDecode) {
   Pickle pickle;
 
   EXPECT_TRUE(pickle.WriteInt(testint));
   EXPECT_TRUE(pickle.WriteString(teststr));
   EXPECT_TRUE(pickle.WriteWString(testwstr));
   EXPECT_TRUE(pickle.WriteBool(testbool1));
   EXPECT_TRUE(pickle.WriteBool(testbool2));
   EXPECT_TRUE(pickle.WriteUInt16(testuint16));
   EXPECT_TRUE(pickle.WriteFloat(testfloat));
   EXPECT_TRUE(pickle.WriteData(testdata, testdatalen));
-
-  // Over allocate BeginWriteData so we can test TrimWriteData.
-  char* dest = pickle.BeginWriteData(testdatalen + 100);
-  EXPECT_TRUE(dest);
-  memcpy(dest, testdata, testdatalen);
-
-  pickle.TrimWriteData(testdatalen);
-
   VerifyResult(pickle);
 
   // test copy constructor
   Pickle pickle2(pickle);
   VerifyResult(pickle2);
 
   // test operator=
   Pickle pickle3;
   pickle3 = pickle;
   VerifyResult(pickle3);
@@ skipping 233 matching lines @@
   EXPECT_TRUE(pickle.WriteBytes(&data, sizeof(data)));
 
   PickleIterator iter(pickle);
   const char* outdata_char = NULL;
   EXPECT_TRUE(pickle.ReadBytes(&iter, &outdata_char, sizeof(data)));
 
   int outdata;
   memcpy(&outdata, outdata_char, sizeof(outdata));
   EXPECT_EQ(data, outdata);
 }