[DevTools] Remove unnecessary emulation checkboxes and simplify UX.

Source/devtools/front_end/responsiveDesignView.css

Index: Source/devtools/front_end/responsiveDesignView.css
diff --git a/Source/devtools/front_end/responsiveDesignView.css b/Source/devtools/front_end/responsiveDesignView.css
index dbbc1fdc05adb9d2eb6d043737ae622fdc66d1ba..0ea1a2402dedd1d6a50a5dc7c78371e38a68f58a 100644
--- a/Source/devtools/front_end/responsiveDesignView.css
+++ b/Source/devtools/front_end/responsiveDesignView.css
@@ -112,10 +112,6 @@
     padding-bottom: 2px;
 }
 
-.responsive-design-section > :not(:nth-child(1)) {
-    margin-left: 18px;
-}
-
 .responsive-design-suite-separator {
     flex: none;
     width: 1px;
@@ -133,6 +129,21 @@
     overflow: hidden;
 }
 
+.responsive-design-button {
+    height: 19px;
+    min-width: 70px;
+    background: rgb(64, 64, 64);
+    display: flex;
+    align-items: center;
+    justify-content: center !important;
+    cursor: pointer;
+}
+
+.responsive-design-button:hover,
+.responsive-design-button:active {
+    background: linear-gradient(to top, rgb(102, 102, 102), rgb(64, 64, 64));
+}
+
 /* Toolbar controls */
 
 .responsive-design-toolbar fieldset,
@@ -147,6 +158,11 @@
     display: none;
 }
 
+.responsive-design-toolbar label {
+    margin-right: 5px;
+    cursor: default !important;
+}
+
 .responsive-design-toolbar input[type='text'] {
     text-align: left;
     background-color: transparent;
@@ -159,10 +175,6 @@
     text-align: center;
 }
 
-.responsive-design-toolbar input[type='text']:not(.numeric) {
-    width: 100%;
-}
-
 .responsive-design-toolbar fieldset:disabled input,
 .responsive-design-toolbar fieldset:disabled button {
     opacity: 0.7;
@@ -199,7 +211,6 @@
 
 .responsive-design-toolbar select {
     height: 18px;
-    width: 220px;
     background-color: rgb(81, 81, 81);
     border: 0;
     margin-left: 10px;
@@ -274,23 +285,7 @@ body.platform-mac .responsive-design-toolbar select {
 /* Expand button */
 
 .responsive-design-section-expand {
-    padding: 0 !important;
-}
-
-.responsive-design-expand-button {
-    height: 19px;
-    min-width: 70px;
-    background: rgb(64, 64, 64);
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    margin: 3px;
-    cursor: pointer;
-}
-
-.responsive-design-expand-button:hover,
-.responsive-design-expand-button:active {
-    background: linear-gradient(to top, rgb(102, 102, 102), rgb(64, 64, 64));
+    padding: 3px !important;
 }
 
 .responsive-design-icon-expand {
@@ -306,14 +301,19 @@ body.platform-mac .responsive-design-toolbar select {
 /* Device section */
 
 .responsive-design-section-device {
-    width: 340px;
+    width: 290px;
 }
 
 .responsive-design-section-device .responsive-design-section-separator {
     background: linear-gradient(to bottom, rgb(255, 186, 68), rgb(255, 119, 0));
 }
 
+.responsive-design-section-device select {
+    width: 220px;
+}
+
 .responsive-design-section-device input[type='text'],
+.responsive-design-section-device input[type='text']::-webkit-input-placeholder,
 .responsive-design-section-device select {
     color: rgb(255, 156, 0);
 }
@@ -325,11 +325,20 @@ body.platform-mac .responsive-design-toolbar select {
 /* Network section */
 
 .responsive-design-section-network {
-    width: 280px;
+    width: 230px;
 }
 
 .responsive-design-section-network select {
     width: 150px;
+}
+
+.responsive-design-section-network input[type='text'] {
+    width: 190px;
+}
+
+.responsive-design-section-network input[type='text'],
+.responsive-design-section-network input[type='text']::-webkit-input-placeholder,
+.responsive-design-section-network select {
     color: rgb(65, 175, 255);
 }