MacViews: Fix setMarkedText in BridgedContentView to take replacementRange into account.

ui/views/cocoa/bridged_content_view.mm

Index: ui/views/cocoa/bridged_content_view.mm
diff --git a/ui/views/cocoa/bridged_content_view.mm b/ui/views/cocoa/bridged_content_view.mm
index 39dae81d1ae28dcbc2ee6a4a3e18ebe4e0f6af36..612fc616e6ceccc6417657969fa126dac50efa16 100644
--- a/ui/views/cocoa/bridged_content_view.mm
+++ b/ui/views/cocoa/bridged_content_view.mm
@@ -1221,6 +1221,8 @@ - (void)setMarkedText:(id)text
 
   if ([text isKindOfClass:[NSAttributedString class]])
     text = [text string];
+
+  textInputClient_->DeleteRange(gfx::Range(replacementRange));

[karandeepb, 2016/07/26 03:40:52]

The only case I have found where a valid replacementRange is being passed is
when accented characters are input. Do you know of any other possible case?
Asking because apple docs for the method say  "replacementRange:The range to
replace, computed from the beginning of the marked text." which seems slightly
incorrect, since replacementRange seems to be computed from the beginning of the
text not only marked/composed text.

[tapted, 2016/07/26 05:40:27]

I don't really know IME code paths TBH. One guess: maybe when tabbing through
choices in the IME input window?

   ui::CompositionText composition;
   composition.text = base::SysNSStringToUTF16(text);
   composition.selection = gfx::Range(selectedRange);