DevTools: remove old Timeline front-end implementation

LayoutTests/inspector/timeline/timeline-window-filter-expected.txt

-Tests the Timeline window filter.
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-It applies different ranges to the OverviewGrid and expects that current view reflects the change.
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-Also it detects that after switching to another view it gets the proper time range.
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-OverviewPane:
-divider offsets: [200, 400, 600, 800, 1000]. We are expecting round numbers.
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-mode = Events
-range = 0 - 1
-time range = 1390988669115.4338 - 1390988670116.917
-records count: 80
-divider offsets: [0, 200, 400, 600, 800, 1000]. We are expecting round numbers.
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-mode = Events
-range = 0.25 - 0.75
-time range = 1390988669365.8047 - 1390988669866.5461
-records count: 49
-divider offsets: [300, 400, 500, 600, 700, 800]. We are expecting round numbers.
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-mode = Events
-range = 0.33 - 0.66
-time range = 1390988669445.9233 - 1390988669776.4126
-records count: 34
-divider offsets: [350, 400, 450, 500, 550, 600, 650, 700]. We are expecting round numbers.
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-mode = Frames
-range = 0 - 1
-time range = 1390988669115.4338 - 1390988670116.917
-records count: 80
-divider offsets: [0, 200, 400, 600, 800, 1000]. We are expecting round numbers.
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-mode = Frames
-range = 0.25 - 0.75
-time range = 1390988669535.377 - 1390988670098.158
-records count: 38
-divider offsets: [500, 600, 700, 800, 900, 1000]. We are expecting round numbers.
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-mode = Frames
-range = 0.33 - 0.66
-time range = 1390988669683.1602 - 1390988670098.158
-records count: 25
-divider offsets: [600, 700, 800, 900, 1000]. We are expecting round numbers.
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-mode = Frames
-time range = 1390988669310.462 - 1390988670098.158
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-mode = Events
-time range = 1390988669310.462 - 1390988670098.158
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-mode = Frames
-time range = 1390988669310.462 - 1390988670098.158
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