MacViews: Fix crash caused due to nil TextInputClient.

ui/views/cocoa/bridged_content_view.mm

 // Copyright 2014 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.
 
 #import "ui/views/cocoa/bridged_content_view.h"
 
 #include "base/logging.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 63 matching lines @@
         ui::POST_DISPATCH_NONE)
       return true;
   }
   return false;
 }
 
 // Returns true if |client| has RTL text.
 bool IsTextRTL(const ui::TextInputClient* client) {
   gfx::Range text_range;
   base::string16 text;
-  return client->GetTextRange(&text_range) &&
+  return client && client->GetTextRange(&text_range) &&
          client->GetTextFromRange(text_range, &text) &&
          base::i18n::GetStringDirection(text) == base::i18n::RIGHT_TO_LEFT;
 }
 
 // Returns the boundary rectangle for composition characters in the
 // |requested_range|. Sets |actual_range| corresponding to the returned
 // rectangle. For cases, where there is no composition text or the
 // |requested_range| lies outside the composition range, a zero width rectangle
 // corresponding to the caret bounds is returned. Logic used is similar to
 // RenderWidgetHostViewMac::GetCachedFirstRectForCharacterRange(...).
@@ skipping 1090 matching lines @@
   }
 
   return [super accessibilityAttributeValue:attribute];
 }
 
 - (id)accessibilityHitTest:(NSPoint)point {
   return [hostedView_->GetNativeViewAccessible() accessibilityHitTest:point];
 }
 
 @end