Reviewed by Pavel Feldman.

        Web Inspector: make SourceFrame TextViewer's delegate for editing operations.
        https://bugs.webkit.org/show_bug.cgi?id=58026

        This is the first step of decoupling TextViewer from SourceFrame.

        * inspector/front-end/SourceFrame.js:
        (WebInspector.SourceFrame):
        (WebInspector.SourceFrame.prototype.show):
        (WebInspector.SourceFrame.prototype.hide):
        (WebInspector.SourceFrame.prototype._ensureContentLoaded):
        (WebInspector.SourceFrame.prototype.contentEditable):
        (WebInspector.SourceFrame.prototype.startEditing):
        (WebInspector.SourceFrame.prototype.endEditing):
        (WebInspector.SourceFrame.prototype._createTextViewer):
        (WebInspector.SourceFrame.prototype._handleSave):
        (WebInspector.SourceFrame.prototype._handleRevertEditing):
        * inspector/front-end/TextViewer.js:
        (WebInspector.TextViewer.prototype._enterInternalTextChangeMode):
        (WebInspector.TextViewer.prototype._exitInternalTextChangeMode):
        (WebInspector.TextViewer.prototype._syncDecorationsForLine):
        (WebInspector.TextViewer.prototype._doubleClick):
        (WebInspector.TextViewerDelegate):
        (WebInspector.TextViewerDelegate.prototype.contentEditable):
        (WebInspector.TextViewerDelegate.prototype.startEditing):
        (WebInspector.TextViewerDelegate.prototype.endEditing):
        (WebInspector.TextEditorMainPanel.prototype._paintScheduledLines):
        (WebInspector.TextEditorMainPanel.prototype._handleDOMUpdates):
        * inspector/front-end/inspector.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@83288 268f45cc-cd09-0410-ab3c-d52691b4dbfc