Revert "Make CFX_WideString::LockBuffer() completely unused."

This reverts commit 5a256ad29483eb2b13e6e2c89fe0f77a9103f68f.
Reason for revert: broke JS tests.

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1112673002

1 files changed, 9 insertions, 0 deletions

diff --git a/core/src/fxcrt/fx_basic_bstring.cpp b/core/src/fxcrt/fx_basic_bstring.cpp
index 961aebe69c..cda7d1fdd7 100644
--- a/core/src/fxcrt/fx_basic_bstring.cpp
+++ b/core/src/fxcrt/fx_basic_bstring.cpp
@@ -341,6 +341,15 @@ void CFX_ByteString::ReleaseBuffer(FX_STRSIZE nNewLength)
     m_pData->m_nDataLength = nNewLength;
     m_pData->m_String[nNewLength] = 0;
 }
+FX_LPSTR CFX_ByteString::LockBuffer()
+{
+    if (m_pData == NULL) {
+        return NULL;
+    }
+    FX_LPSTR lpsz = GetBuffer(0);
+    m_pData->m_nRefs = -1;
+    return lpsz;
+}
 void CFX_ByteString::Reserve(FX_STRSIZE len)
 {
     GetBuffer(len);