Introduce new async IPC message to get file icons

third_party/WebKit/WebCore/WebCore.gypi

 {
     'variables': {
         'webcore_bindings_idl_files': [
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
             'css/CSSPrimitiveValue.idl',
             'css/CSSRule.idl',
@@ skipping 2050 matching lines @@
             'platform/graphics/chromium/FontPlatformDataChromiumWin.cpp',
             'platform/graphics/chromium/FontPlatformDataChromiumWin.h',
             'platform/graphics/chromium/FontPlatformDataLinux.cpp',
             'platform/graphics/chromium/FontPlatformDataLinux.h',
             'platform/graphics/chromium/FontUtilsChromiumWin.cpp',
             'platform/graphics/chromium/FontUtilsChromiumWin.h',
             'platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp',
             'platform/graphics/chromium/GlyphPageTreeNodeLinux.cpp',
             'platform/graphics/chromium/GraphicsLayerChromium.cpp',
             'platform/graphics/chromium/GraphicsLayerChromium.h',
-            'platform/graphics/chromium/IconChromiumLinux.cpp',
-            'platform/graphics/chromium/IconChromiumMac.cpp',
-            'platform/graphics/chromium/IconChromiumWin.cpp',
+            'platform/graphics/chromium/IconChromium.cpp',
             'platform/graphics/chromium/ImageBufferData.h',
             'platform/graphics/chromium/ImageChromiumMac.mm',
             'platform/graphics/chromium/LayerChromium.cpp',
             'platform/graphics/chromium/LayerChromium.h',
             'platform/graphics/chromium/LayerRendererChromium.cpp',
             'platform/graphics/chromium/LayerRendererChromium.h',
             'platform/graphics/chromium/MediaPlayerPrivateChromium.h',
             'platform/graphics/chromium/PlatformIcon.h',
             'platform/graphics/chromium/SimpleFontDataChromiumWin.cpp',
             'platform/graphics/chromium/SimpleFontDataLinux.cpp',
@@ skipping 1952 matching lines @@
             'inspector/front-end/Images/userInputPreviousIcon.png',
             'inspector/front-end/Images/userInputResultIcon.png',
             'inspector/front-end/Images/warningIcon.png',
             'inspector/front-end/Images/warningOrangeDot.png',
             'inspector/front-end/Images/warningMediumIcon.png',
             'inspector/front-end/Images/warningsErrors.png',
             'inspector/front-end/Images/whiteConnectorPoint.png'
         ],
     }
 }