Move WebMIMERegistry impl from //content to blink:platform/network/mime

content/renderer/renderer_blink_platform_impl.h

Index: content/renderer/renderer_blink_platform_impl.h
diff --git a/content/renderer/renderer_blink_platform_impl.h b/content/renderer/renderer_blink_platform_impl.h
index f99e89a75c38256f394d6083a1369b0f39188532..21e149abc813a606c4350e728ce2d6b81d539b34 100644
--- a/content/renderer/renderer_blink_platform_impl.h
+++ b/content/renderer/renderer_blink_platform_impl.h
@@ -80,7 +80,6 @@ class CONTENT_EXPORT RendererBlinkPlatformImpl : public BlinkPlatformImpl {
   }
   // Platform methods:
   blink::WebClipboard* clipboard() override;
-  blink::WebMimeRegistry* mimeRegistry() override;
   blink::WebFileUtilities* fileUtilities() override;
   blink::WebSandboxSupport* sandboxSupport() override;
   blink::WebCookieJar* cookieJar() override;
@@ -264,9 +263,6 @@ class CONTENT_EXPORT RendererBlinkPlatformImpl : public BlinkPlatformImpl {
   class FileUtilities;
   std::unique_ptr<FileUtilities> file_utilities_;
 
-  class MimeRegistry;
-  std::unique_ptr<MimeRegistry> mime_registry_;
-
 #if !defined(OS_ANDROID) && !defined(OS_WIN)
   class SandboxSupport;
   std::unique_ptr<SandboxSupport> sandbox_support_;