Remove ScriptSourceCode(ScriptResource*) constructor

No longer used after
https://chromium-review.googlesource.com/801665.

To make upcoming refactoring easy.

Bug: 788828
Change-Id: Ie5ac6409c3d1c7ee113c90cff834a5ae6be53537
Reviewed-on: https://chromium-review.googlesource.com/786890
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521020}

third_party/WebKit/Source/bindings/core/v8/ScriptSourceCode.cpp

@@ -23,9 +23,6 @@ ScriptSourceCode::ScriptSourceCode(
     url_.RemoveFragmentIdentifier();
 }
 
-ScriptSourceCode::ScriptSourceCode(ScriptResource* resource)
-    : ScriptSourceCode(nullptr, resource) {}
-
 ScriptSourceCode::ScriptSourceCode(ScriptStreamer* streamer,
                                    ScriptResource* resource)
     : source_(resource->SourceText()),

third_party/WebKit/Source/bindings/core/v8/ScriptSourceCode.h

@@ -46,14 +46,17 @@ class CORE_EXPORT ScriptSourceCode final {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
-  // We lose the encoding information from ScriptResource.
-  // Not sure if that matters.
-  explicit ScriptSourceCode(ScriptResource*);
+  // For inline scripts.
   ScriptSourceCode(
       const String& source,
       ScriptSourceLocationType = ScriptSourceLocationType::kUnknown,
       const KURL& = KURL(),
       const TextPosition& start_position = TextPosition::MinimumPosition());
+
+  // For external scripts.
+  //
+  // We lose the encoding information from ScriptResource.
+  // Not sure if that matters.
   ScriptSourceCode(ScriptStreamer*, ScriptResource*);
 
   ~ScriptSourceCode();