[DevTools] Do not report edited resources via Page.getResourceContent.

LayoutTests/inspector/sources/debugger/network-uisourcecode-provider-expected.txt

 Tests NetworkUISourceCodeProvider class.
 
 
 Running: testDocumentResource
 Creating resource.
 UISourceCode: http://fake.url/1
 UISourceCode is content script: false
 Highlighter type: text/html
 UISourceCode content: <document resource content>
 
-Running: testScriptResource

[pfeldman, 2015/08/12 23:38:42]

Why did the expectations change? Your change should not have functional changes
for this use case, no?

[dgozman, 2015/08/13 18:27:26]

Test was checking that we add UISourceCode for script resources, which we do not
anymore.
Same for stylesheets.

-Creating resource.
-UISourceCode: http://fake.url/2
-UISourceCode is content script: false
-Highlighter type: text/javascript
-UISourceCode content: <script resource content>
-
-Running: testVMScript
+Running: testScriptResourceAndVMScript
+Creating script resource.
 Creating script.
 UISourceCode: http://fake.url/3
 UISourceCode is content script: false
 Highlighter type: text/javascript
 UISourceCode content: <script content>
 
-Running: testStylesheetResource
-Creating resource.
-UISourceCode: http://fake.url/4
-Highlighter type: text/css
-UISourceCode content: <stylesheet resource content>
-
 Running: testRemoveStyleSheetFromModelWithComplexURL
+Creating stylesheet resource.
 Added uiSourceCode: http://example.com/foo.css
 Removed uiSourceCode: http://example.com/foo.css
 
 Running: testRemoveStyleSheetFromModelWithSimpleURL
+Creating stylesheet resource.
 Added uiSourceCode: foo.css
 Removed uiSourceCode: foo.css