Fix two truncation bugs in harfbuzz-indic shaper.

third_party/harfbuzz/chromium.patch

Index: third_party/harfbuzz/chromium.patch
===================================================================
--- third_party/harfbuzz/chromium.patch	(revision 113251)
+++ third_party/harfbuzz/chromium.patch	(working copy)
@@ -34,20 +34,6 @@
  #ifndef NO_OPENTYPE
  
      if (HB_SelectScript(item, item->item.script == HB_Script_Arabic ? arabic_features : syriac_features)) {
-diff --git a/src/harfbuzz-gpos.c b/src/harfbuzz-gpos.c
-index a216005..7bd3b3b 100644
---- a/src/harfbuzz-gpos.c
-+++ b/src/harfbuzz-gpos.c
-@@ -3012,6 +3012,9 @@ static HB_Error  Lookup_MarkMarkPos( GPOS_Instance*    gpi,
-     j--;
-   }
- 
-+  if ( i > buffer->in_pos )
-+    return HB_Err_Not_Covered;
-+
-   error = _HB_OPEN_Coverage_Index( &mmp->Mark2Coverage, IN_GLYPH( j ),
- 			  &mark2_index );
-   if ( error )
 diff --git a/src/harfbuzz-shaper.cpp b/src/harfbuzz-shaper.cpp
 index ce4d4ac..5999e08 100644
 --- a/src/harfbuzz-shaper.cpp
@@ -134,16 +120,3 @@
  } HB_ShaperFlag;
  
  /* 
-diff --git a/src/harfbuzz-tibetan.c b/src/harfbuzz-tibetan.c
-index bfa31b1..847ac52 100644
---- a/src/harfbuzz-tibetan.c
-+++ b/src/harfbuzz-tibetan.c
-@@ -90,7 +90,7 @@ static const unsigned char tibetanForm[0x80] = {
- 
- 
- #define tibetan_form(c) \
--    (TibetanForm)tibetanForm[c - 0x0f40]
-+    ((c) >= 0x0f40 && (c) <= 0x0fc0 ? (TibetanForm)tibetanForm[(c) - 0x0f40] : TibetanOther)
- 
- static const HB_OpenTypeFeature tibetan_features[] = {
-     { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty },