DevTools: remove old Timeline front-end implementation

LayoutTests/SlowTests

 # See http://www.chromium.org/developers/testing/webkit-layout-tests/testexpectations for more information on this file.
 
 # This file should only mark tests as Slow. If they are failing in some other way, that listing should be in TestExpectations.
 # Lines listed in both files will have the *union* of the expectations.
 
 # In general, we should list tests in this file if they are slower than ~30% of the default timeout time, as we
 # can see a 3x variance or more in test times on the bots. In practice, this means that any test that takes longer
 # than 2 seconds in Release mode or 6 seconds in Debug mode should be listed here.
 
 crbug.com/24182 [ Debug ] fast/js/toString-and-valueOf-override.html [ Slow ]
@@ skipping 82 matching lines @@
 crbug.com/247466 [ Release ] inspector/profiler/heap-snapshot-comparison-expansion-preserved-when-sorting.html [ Slow ]
 crbug.com/254988 inspector/sources/debugger/debugger-breakpoints-not-activated-on-reload.html [ Slow ]
 crbug.com/254988 inspector/sources/debugger/callstack-placards-discarded.html [ Slow ]
 crbug.com/327078 http/tests/inspector/network/long-script-content.html [ Slow ]
 crbug.com/247466 [ Debug ] inspector-enabled/sources/debugger/script-formatter-breakpoints-1.html [ Slow ]
 crbug.com/247466 [ Debug ] inspector-enabled/sources/debugger/script-formatter-breakpoints-4.html [ Slow ]
 crbug.com/394210 [ Release ] inspector/profiler/webgl/webgl-profiler-api-changes.html [ Slow ]
 crbug.com/420008 [ Release ] inspector/tracing [ Slow ]
 crbug.com/420008 [ Release ] virtual/implsidepainting/inspector/tracing [ Slow ]
 crbug.com/420008 [ Release ] virtual/deferred/inspector/tracing [ Slow ]
-crbug.com/420008 [ Release ] inspector/timeline [ Slow ]
-crbug.com/420008 [ Release ] virtual/implsidepainting/inspector/timeline [ Slow ]
-crbug.com/420008 [ Release ] virtual/deferred/inspector/timeline [ Slow ]
 crbug.com/420008 [ Release ] inspector/editor/text-editor-word-jumps.html [ Slow ]
 crbug.com/420008 [ Release ] http/tests/inspector/console-xhr-logging.html [ Slow ]
 # inspector tests below are slow on LinuxASAN
 crbug.com/247466 [ Linux Release ] inspector/sources/debugger/debugger-activation-crash2.html [ Slow ]
 
 # This test is intentionally SLOW as we're waiting for a connection timeout.
 crbug.com/73609 http/tests/media/video-play-stall.html [ Slow ]
 
 # This test uses a throttled load to stay in NETWORK_LOADING.
 crbug.com/400659 http/tests/media/gc-while-network-loading.html [ Slow ]
@@ skipping 43 matching lines @@
 crbug.com/248969 [ Debug ] printing/page-count-with-one-word.html [ Slow ]
 
 crbug.com/393573 [ Win ] http/tests/htmlimports/csp-import-block-but-nonce-nested.html [ Slow ]
 
 crbug.com/336481 inspector/jump-to-previous-editing-location.html [ Slow ]
 
 crbug.com/346259 http/tests/websocket/no-crash-on-cookie-flood.html [ Slow ]
 
 crbug.com/358313 virtual/gpu/fast/canvas/webgl/webgl-large-texture.html [ Slow ]
 
-crbug.com/298188 virtual/implsidepainting/inspector/timeline/timeline-paint.html [ Slow ]
-
-crbug.com/24182 crbug.com/318490 [ Win Linux Android ] virtual/implsidepainting/inspector/timeline/timeline-decode-resize.html [ Slow ]
-
 crbug.com/313338 inspector/sources/debugger/debugger-proto-property.html [ Slow ]
 
 crbug.com/331186 [ Debug ] css3/flexbox/position-absolute-child.html [ Slow ]
 
 crbug.com/362503 http/tests/xmlhttprequest/xmlhttprequest-responseXML-exception.html [ Slow ]
 crbug.com/362509 [ Debug ] fast/parser/xml-error-adopted.xml [ Slow ]
 
 crbug.com/363029 virtual/gpu/fast/canvas/canvas-composite-stroke-alpha.html [ Slow ]
 crbug.com/364225 virtual/gpu/fast/canvas/canvas-composite-text-alpha.html [ Slow ]
 
 crbug.com/372424 fast/dom/DOMImplementation/createDocument-with-used-doctype.html [ Slow ]
 
 crbug.com/372424 http/tests/serviceworker/chromium/registration-stress.html [ Slow ]