Enforce marking "override" for functions overriding Blink.

content/ppapi_plugin/ppapi_blink_platform_impl.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 "content/ppapi_plugin/ppapi_blink_platform_impl.h"
 
 #include <map>
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
@@ skipping 27 matching lines @@
 #if !defined(OS_ANDROID) && !defined(OS_WIN)
 
 class PpapiBlinkPlatformImpl::SandboxSupport : public WebSandboxSupport {
  public:
   virtual ~SandboxSupport() {}
 
 #if defined(OS_MACOSX)
   bool loadFont(NSFont* srcFont, CGFontRef* out, uint32_t* fontID) override;
 #elif defined(OS_POSIX)
   SandboxSupport();
-  void getFallbackFontForCharacter(WebUChar32 character,
-                                   const char* preferred_locale,
-                                   blink::WebFallbackFont* fallbackFont);
+  void getFallbackFontForCharacter(
+      WebUChar32 character,
+      const char* preferred_locale,
+      blink::WebFallbackFont* fallbackFont) override;
   void getRenderStyleForStrike(const char* family,
                                int sizeAndStyle,
                                blink::WebFontRenderStyle* out) override;
 
  private:
   // WebKit likes to ask us for the correct font family to use for a set of
   // unicode code points. It needs this information frequently so we cache it
   // here.
   std::map<int32_t, blink::WebFallbackFont> unicode_font_families_;
   // For debugging crbug.com/312965
@@ skipping 182 matching lines @@
 }
 
 int PpapiBlinkPlatformImpl::databaseDeleteFile(
     const blink::WebString& vfs_file_name,
     bool sync_dir) {
   NOTREACHED();
   return 0;
 }
 
 }  // namespace content