DevTools: remove style reuse from flamechart clients, prepare it to become a component.

Source/devtools/front_end/flameChart.css

Index: Source/devtools/front_end/flameChart.css
diff --git a/Source/devtools/front_end/flameChart.css b/Source/devtools/front_end/flameChart.css
index c65940b7540636662a57d12aa47bfbd611f8bab0..c27f53051f88b587708fd5b042af5183f10000e4 100644
--- a/Source/devtools/front_end/flameChart.css
+++ b/Source/devtools/front_end/flameChart.css
@@ -1,35 +1,7 @@
-.overview-container {
-    overflow: hidden;
-    position: absolute;
-    top: 0;
-    width: 100%;
-    height: 80px;
-}
-
-#flame-chart-overview-grid .resources-dividers-label-bar {
-    pointer-events: auto;
-}
-
 .flame-chart-main-pane {
     overflow: hidden;
 }
 
-.flame-chart-overview-pane {
-    flex: 0 0 80px !important;
-}
-
-#flame-chart-overview-container {
-    border-bottom: 1px solid rgba(0, 0, 0, 0.3);
-}
-
-.flame-chart-overview-canvas {
-    position: absolute;
-    top: 20px;
-    left: 0;
-    right: 0;
-    bottom: 0;
-}
-
 .flame-chart-marker-highlight-element {
     position: absolute;
     top: 0;