Avoid duplicate functions/code in core/inspector.

third_party/WebKit/Source/core/inspector/InspectorPageAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
index ce78a23a97b0cdbac43d06f8ee7ac7473c66071e..6d7f34e080e75393a2719d631b05869191c93280 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorPageAgent.h
@@ -33,6 +33,7 @@
 
 #include "core/CoreExport.h"
 #include "core/inspector/InspectorBaseAgent.h"
+#include "core/inspector/InspectorHelpers.h"
 #include "core/inspector/protocol/Page.h"
 #include "core/page/ChromeClient.h"
 #include "platform/wtf/HashMap.h"
@@ -199,12 +200,6 @@ class CORE_EXPORT InspectorPageAgent final
       bool is_regex,
       std::unique_ptr<SearchInResourceCallback>);
 
-  static bool DataContent(const char* data,
-                          unsigned size,
-                          const String& text_encoding_name,
-                          bool with_base64_encode,
-                          String* result);
-
   void PageLayoutInvalidated(bool resized);
 
   std::unique_ptr<protocol::Page::Frame> BuildObjectForFrame(LocalFrame*);